{"id":1830,"date":"2018-02-05T16:02:48","date_gmt":"2018-02-05T15:02:48","guid":{"rendered":"https:\/\/the-7th-day.de\/blog\/?p=1830"},"modified":"2025-09-01T13:30:47","modified_gmt":"2025-09-01T11:30:47","slug":"how-black-and-white-photo-paper-becomes-colored","status":"publish","type":"post","link":"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/","title":{"rendered":"How black and white photo paper becomes colored"},"content":{"rendered":"\n<p>One question we are often asked is why our Camera Obscura photographs display so many different colors.<\/p>\n\n\n\n<p>A key reason lies in the&nbsp;<strong>photographic paper<\/strong>&nbsp;we use. Each type of paper has its own chemical composition and therefore reacts differently to light. In our project, we use hundreds of different papers \u2013 some of them more than 50 years old. (see images below)<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-2 is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/Fotopapier-2-The-7th-Day.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"700\" data-id=\"1833\" src=\"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/Fotopapier-2-The-7th-Day.jpg\" alt=\"Photo paper, pinhole camera, The 7th Day\" class=\"wp-image-1833\" srcset=\"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/Fotopapier-2-The-7th-Day.jpg 700w, https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/Fotopapier-2-The-7th-Day-300x300.jpg 300w, https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/Fotopapier-2-The-7th-Day-100x100.jpg 100w, https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/Fotopapier-2-The-7th-Day-510x510.jpg 510w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/a><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/Fotopapier-The-7th-Day.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"700\" data-id=\"1834\" src=\"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/Fotopapier-The-7th-Day.jpg\" alt=\"Photo paper, pinhole camera, The 7th Day\" class=\"wp-image-1834\" srcset=\"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/Fotopapier-The-7th-Day.jpg 700w, https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/Fotopapier-The-7th-Day-300x300.jpg 300w, https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/Fotopapier-The-7th-Day-100x100.jpg 100w, https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/Fotopapier-The-7th-Day-510x510.jpg 510w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/a><\/figure>\n<\/figure>\n\n\n\n<p>Comparing Different Photographic Papers<\/p>\n\n\n\n<p>To illustrate these differences, we carried out a small experiment:<br>We exposed fifteen different types of photographic paper to light. Half of each sheet was covered with black cardboard (Image 1).<\/p>\n\n\n\n<p><strong>Result<\/strong>: In Image 4 the different color nuances of each paper can clearly be seen.<\/p>\n\n\n\n<p><strong>After two hours of exposure<\/strong>: the uncovered parts had already darkened significantly.<\/p>\n\n\n\n<p><strong>After another two and a half hours<\/strong>: the previously covered areas also darkened until each sheet showed a uniform tone (Image 2\u20133).<\/p>\n\n\n\n<div id='gallery-1' class='gallery galleryid-1830 gallery-columns-4 gallery-size-thumbnail'><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/IMG_7415.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"258\" src=\"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/IMG_7415.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"1-Photo paper covered\" aria-describedby=\"gallery-1-1836\" srcset=\"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/IMG_7415.jpg 570w, https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/IMG_7415-510x439.jpg 510w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>\n\t\t\t<\/div>\n\t\t\t\t<figcaption class='wp-caption-text gallery-caption' id='gallery-1-1836'>\n\t\t\t\t1-Photo paper covered\n\t\t\t\t<\/figcaption><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/IMG_7423.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"258\" src=\"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/IMG_7423.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"2-Photo paper after 2 hours\" aria-describedby=\"gallery-1-1837\" srcset=\"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/IMG_7423.jpg 656w, https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/IMG_7423-510x438.jpg 510w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>\n\t\t\t<\/div>\n\t\t\t\t<figcaption class='wp-caption-text gallery-caption' id='gallery-1-1837'>\n\t\t\t\t2-Photo paper after 2,5 hours\n\t\t\t\t<\/figcaption><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/IMG_7435.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"250\" src=\"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/IMG_7435.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"3-Photo paper after 2,5 hours\" aria-describedby=\"gallery-1-1838\" srcset=\"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/IMG_7435.jpg 661w, https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/IMG_7435-510x424.jpg 510w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>\n\t\t\t<\/div>\n\t\t\t\t<figcaption class='wp-caption-text gallery-caption' id='gallery-1-1838'>\n\t\t\t\t3-Photo paper after 2,5 hours\n\t\t\t\t<\/figcaption><\/figure><figure class='gallery-item'>\n\t\t\t<div class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/IMG_7442.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"254\" src=\"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/IMG_7442.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"4-Photo paper after 3 hours\" aria-describedby=\"gallery-1-1839\" srcset=\"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/IMG_7442.jpg 685w, https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/IMG_7442-510x432.jpg 510w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>\n\t\t\t<\/div>\n\t\t\t\t<figcaption class='wp-caption-text gallery-caption' id='gallery-1-1839'>\n\t\t\t\t4-Photo paper after 3 hours\n\t\t\t\t<\/figcaption><\/figure>\n\t\t<\/div>\n\n\n\n\n<figure class=\"wp-block-image alignleft\"><a href=\"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/Negativ-und-Positiv.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/Negativ-und-Positiv-300x300.jpg\" alt=\"Negative and Positive\" class=\"wp-image-1841\" srcset=\"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/Negativ-und-Positiv-300x300.jpg 300w, https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2018\/02\/Negativ-und-Positiv-100x100.jpg 100w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption class=\"wp-element-caption\">Negative (left) and Positive (right), No 1465<\/figcaption><\/figure>\n\n\n\n<p>Negative and Positive \u2013 An Example<\/p>\n\n\n\n<p>In the following image you see on the left a sheet of photographic paper exposed for&nbsp;<strong>one year<\/strong>&nbsp;as a negative:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Areas with a lot of sunlight appear in deep blue (for example, the traces of the sun).<\/li>\n\n\n\n<li>Areas with less light exposure remain brighter (such as the house in the picture).<\/li>\n<\/ul>\n\n\n\n<p>When we invert this negative into a&nbsp;<strong>positive<\/strong>, the complementary colors emerge:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The blue traces of the sun become a strong red.<\/li>\n\n\n\n<li>The house shifts from purple\/yellow to green\/blue.<\/li>\n<\/ul>\n\n\n\n<p>Photographs with a\u00a0<strong>short exposure time (7\u201314 days)<\/strong>\u00a0usually appear more monochrome.<br>With\u00a0<strong>long-term exposures<\/strong>, however, a wide spectrum of colors often develops.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Chance as Part of the Art Project<\/h2>\n\n\n\n<p>What the final image will look like is something we can never predict. This element of chance is an essential part of our project: every photograph becomes a unique work of art.<\/p>\n\n\n\n<p>We would like to thank the&nbsp;<strong>I.G. Schwarz-Wei\u00df Fotoclub Weil der Stadt e.V.<\/strong>&nbsp;for kindly providing the photographic papers used in this experiment.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>One question we are often asked is why our Camera Obscura photographs display so many different colors. A key reason lies in the&nbsp;photographic paper&nbsp;we use. Each type of paper has its own chemical composition and therefore reacts differently to light. In our project, we use hundreds of different papers \u2013 some of them more than [&#8230;]\n","protected":false},"author":1,"featured_media":1729,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[37,121],"tags":[],"class_list":["post-1830","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-allgemein-en","category-the-randomness-decides"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How black and white photo paper becomes colored - The 7th Day<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How black and white photo paper becomes colored - The 7th Day\" \/>\n<meta property=\"og:description\" content=\"One question we are often asked is why our Camera Obscura photographs display so many different colors. A key reason lies in the&nbsp;photographic paper&nbsp;we use. Each type of paper has its own chemical composition and therefore reacts differently to light. In our project, we use hundreds of different papers \u2013 some of them more than [...]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/\" \/>\n<meta property=\"og:site_name\" content=\"The 7th Day\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/the7tday\" \/>\n<meta property=\"article:published_time\" content=\"2018-02-05T15:02:48+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-09-01T11:30:47+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2017\/12\/Unbenannt-2.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t<meta property=\"og:image:height\" content=\"800\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Patrick Zajfert\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Verfasst von\" \/>\n\t<meta name=\"twitter:data1\" content=\"Patrick Zajfert\" \/>\n\t<meta name=\"twitter:label2\" content=\"Gesch\u00e4tzte Lesezeit\" \/>\n\t<meta name=\"twitter:data2\" content=\"3\u00a0Minuten\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/\"},\"author\":{\"name\":\"Patrick Zajfert\",\"@id\":\"https:\/\/the-7th-day.de\/blog\/#\/schema\/person\/4b7ae4fc558a13ab330ab9aea92ae9a9\"},\"headline\":\"How black and white photo paper becomes colored\",\"datePublished\":\"2018-02-05T15:02:48+00:00\",\"dateModified\":\"2025-09-01T11:30:47+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/\"},\"wordCount\":342,\"publisher\":{\"@id\":\"https:\/\/the-7th-day.de\/blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2017\/12\/Unbenannt-2.jpg\",\"articleSection\":{\"1\":\"The randomness decides\"},\"inLanguage\":\"de\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/\",\"url\":\"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/\",\"name\":\"How black and white photo paper becomes colored - The 7th Day\",\"isPartOf\":{\"@id\":\"https:\/\/the-7th-day.de\/blog\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2017\/12\/Unbenannt-2.jpg\",\"datePublished\":\"2018-02-05T15:02:48+00:00\",\"dateModified\":\"2025-09-01T11:30:47+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/#breadcrumb\"},\"inLanguage\":\"de\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"de\",\"@id\":\"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/#primaryimage\",\"url\":\"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2017\/12\/Unbenannt-2.jpg\",\"contentUrl\":\"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2017\/12\/Unbenannt-2.jpg\",\"width\":800,\"height\":800,\"caption\":\"Warum verf\u00e4rbt sich schwarzwei\u00df Fotopapier?\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Front Page\",\"item\":\"https:\/\/the-7th-day.de\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"How black and white photo paper becomes colored\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/the-7th-day.de\/blog\/#website\",\"url\":\"https:\/\/the-7th-day.de\/blog\/\",\"name\":\"The 7th Day\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\/\/the-7th-day.de\/blog\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/the-7th-day.de\/blog\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"de\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/the-7th-day.de\/blog\/#organization\",\"name\":\"The 7th Day\",\"url\":\"https:\/\/the-7th-day.de\/blog\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"de\",\"@id\":\"https:\/\/the-7th-day.de\/blog\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2025\/07\/7th-Day-logo-scaled.webp\",\"contentUrl\":\"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2025\/07\/7th-Day-logo-scaled.webp\",\"width\":2048,\"height\":506,\"caption\":\"The 7th Day\"},\"image\":{\"@id\":\"https:\/\/the-7th-day.de\/blog\/#\/schema\/logo\/image\/\"},\"sameAs\":[\"https:\/\/www.facebook.com\/the7tday\",\"https:\/\/www.instagram.com\/the7thday\/\",\"https:\/\/de.pinterest.com\/the7thdayGE\/\"]},{\"@type\":\"Person\",\"@id\":\"https:\/\/the-7th-day.de\/blog\/#\/schema\/person\/4b7ae4fc558a13ab330ab9aea92ae9a9\",\"name\":\"Patrick Zajfert\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"de\",\"@id\":\"https:\/\/the-7th-day.de\/blog\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/cb6e3434974f3c50d44f42b6facfba0c37e4e274d88e8285933eb653423a5b2f?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/cb6e3434974f3c50d44f42b6facfba0c37e4e274d88e8285933eb653423a5b2f?s=96&d=mm&r=g\",\"caption\":\"Patrick Zajfert\"},\"url\":\"https:\/\/the-7th-day.de\/blog\/author\/master\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"How black and white photo paper becomes colored - The 7th Day","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/","og_locale":"de_DE","og_type":"article","og_title":"How black and white photo paper becomes colored - The 7th Day","og_description":"One question we are often asked is why our Camera Obscura photographs display so many different colors. A key reason lies in the&nbsp;photographic paper&nbsp;we use. Each type of paper has its own chemical composition and therefore reacts differently to light. In our project, we use hundreds of different papers \u2013 some of them more than [...]","og_url":"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/","og_site_name":"The 7th Day","article_publisher":"https:\/\/www.facebook.com\/the7tday","article_published_time":"2018-02-05T15:02:48+00:00","article_modified_time":"2025-09-01T11:30:47+00:00","og_image":[{"width":800,"height":800,"url":"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2017\/12\/Unbenannt-2.jpg","type":"image\/jpeg"}],"author":"Patrick Zajfert","twitter_card":"summary_large_image","twitter_misc":{"Verfasst von":"Patrick Zajfert","Gesch\u00e4tzte Lesezeit":"3\u00a0Minuten"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/#article","isPartOf":{"@id":"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/"},"author":{"name":"Patrick Zajfert","@id":"https:\/\/the-7th-day.de\/blog\/#\/schema\/person\/4b7ae4fc558a13ab330ab9aea92ae9a9"},"headline":"How black and white photo paper becomes colored","datePublished":"2018-02-05T15:02:48+00:00","dateModified":"2025-09-01T11:30:47+00:00","mainEntityOfPage":{"@id":"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/"},"wordCount":342,"publisher":{"@id":"https:\/\/the-7th-day.de\/blog\/#organization"},"image":{"@id":"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/#primaryimage"},"thumbnailUrl":"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2017\/12\/Unbenannt-2.jpg","articleSection":{"1":"The randomness decides"},"inLanguage":"de"},{"@type":"WebPage","@id":"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/","url":"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/","name":"How black and white photo paper becomes colored - The 7th Day","isPartOf":{"@id":"https:\/\/the-7th-day.de\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/#primaryimage"},"image":{"@id":"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/#primaryimage"},"thumbnailUrl":"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2017\/12\/Unbenannt-2.jpg","datePublished":"2018-02-05T15:02:48+00:00","dateModified":"2025-09-01T11:30:47+00:00","breadcrumb":{"@id":"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/#breadcrumb"},"inLanguage":"de","potentialAction":[{"@type":"ReadAction","target":["https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/"]}]},{"@type":"ImageObject","inLanguage":"de","@id":"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/#primaryimage","url":"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2017\/12\/Unbenannt-2.jpg","contentUrl":"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2017\/12\/Unbenannt-2.jpg","width":800,"height":800,"caption":"Warum verf\u00e4rbt sich schwarzwei\u00df Fotopapier?"},{"@type":"BreadcrumbList","@id":"https:\/\/the-7th-day.de\/blog\/en\/how-black-and-white-photo-paper-becomes-colored\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Front Page","item":"https:\/\/the-7th-day.de\/blog\/"},{"@type":"ListItem","position":2,"name":"How black and white photo paper becomes colored"}]},{"@type":"WebSite","@id":"https:\/\/the-7th-day.de\/blog\/#website","url":"https:\/\/the-7th-day.de\/blog\/","name":"The 7th Day","description":"","publisher":{"@id":"https:\/\/the-7th-day.de\/blog\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/the-7th-day.de\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"de"},{"@type":"Organization","@id":"https:\/\/the-7th-day.de\/blog\/#organization","name":"The 7th Day","url":"https:\/\/the-7th-day.de\/blog\/","logo":{"@type":"ImageObject","inLanguage":"de","@id":"https:\/\/the-7th-day.de\/blog\/#\/schema\/logo\/image\/","url":"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2025\/07\/7th-Day-logo-scaled.webp","contentUrl":"https:\/\/the-7th-day.de\/blog\/wp-content\/uploads\/2025\/07\/7th-Day-logo-scaled.webp","width":2048,"height":506,"caption":"The 7th Day"},"image":{"@id":"https:\/\/the-7th-day.de\/blog\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/the7tday","https:\/\/www.instagram.com\/the7thday\/","https:\/\/de.pinterest.com\/the7thdayGE\/"]},{"@type":"Person","@id":"https:\/\/the-7th-day.de\/blog\/#\/schema\/person\/4b7ae4fc558a13ab330ab9aea92ae9a9","name":"Patrick Zajfert","image":{"@type":"ImageObject","inLanguage":"de","@id":"https:\/\/the-7th-day.de\/blog\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/cb6e3434974f3c50d44f42b6facfba0c37e4e274d88e8285933eb653423a5b2f?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/cb6e3434974f3c50d44f42b6facfba0c37e4e274d88e8285933eb653423a5b2f?s=96&d=mm&r=g","caption":"Patrick Zajfert"},"url":"https:\/\/the-7th-day.de\/blog\/author\/master\/"}]}},"_links":{"self":[{"href":"https:\/\/the-7th-day.de\/blog\/wp-json\/wp\/v2\/posts\/1830","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/the-7th-day.de\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/the-7th-day.de\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/the-7th-day.de\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/the-7th-day.de\/blog\/wp-json\/wp\/v2\/comments?post=1830"}],"version-history":[{"count":7,"href":"https:\/\/the-7th-day.de\/blog\/wp-json\/wp\/v2\/posts\/1830\/revisions"}],"predecessor-version":[{"id":3840,"href":"https:\/\/the-7th-day.de\/blog\/wp-json\/wp\/v2\/posts\/1830\/revisions\/3840"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/the-7th-day.de\/blog\/wp-json\/wp\/v2\/media\/1729"}],"wp:attachment":[{"href":"https:\/\/the-7th-day.de\/blog\/wp-json\/wp\/v2\/media?parent=1830"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/the-7th-day.de\/blog\/wp-json\/wp\/v2\/categories?post=1830"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/the-7th-day.de\/blog\/wp-json\/wp\/v2\/tags?post=1830"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}