{"id":25300,"date":"2023-01-24T09:56:11","date_gmt":"2023-01-24T08:56:11","guid":{"rendered":"https:\/\/schrader-institute.de\/praxiswissen\/hair-dyes\/"},"modified":"2023-08-02T08:41:45","modified_gmt":"2023-08-02T07:41:45","slug":"hair-dyes","status":"publish","type":"praxiswissen","link":"https:\/\/schrader-institute.de\/en\/knowledge\/hair-dyes\/","title":{"rendered":"Hair Dyes"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"25300\" class=\"elementor elementor-25300 elementor-25290\" data-elementor-post-type=\"praxiswissen\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-685a2b2 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"685a2b2\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-50105f7\" data-id=\"50105f7\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-c8e486a elementor-widget elementor-widget-heading\" data-id=\"c8e486a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Testing of Application and Dyeing Results<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-98cc25f elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"98cc25f\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-f1a9700\" data-id=\"f1a9700\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-3eb5d8b elementor-widget elementor-widget-text-editor\" data-id=\"3eb5d8b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Hair dyes are tested directly on test subjects or in laboratory tests on hair strands. Trained hairdressers use the products to be tested in the salon and assess this directly following application as well as following several washings for important technical hairdressing parameters such as fragrance, consistency, spreadability, color depth, shade\/color, coloration of scalp, coverage of gray hair, and evenness.<\/p>\n<p>If hair coloring results of two products are to be compared directly in test subjects (half-head test), comparable tests must be performed previously on hair tresses. If these in vitro tests reveal no significant differences in color, the products can then be used in a half-head test.<\/p>\n<p>In addition to hair dyes, eyebrow and eyelash dyes can also be tested. For this, comparative assessments are performed during half-head tests to determine the application properties and dyeing results of the products in our in-house climate-controlled salon.<\/p>\n<p>To determine the lightening performance of bleaching agents, hair tresses are examined spectrophotometrically before and after a standardized bleaching.<\/p>\n<p>The color permeation of hair dyes is measured by taking cross sections and subsequent image analysis.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-703abf5 elementor-widget elementor-widget-text-editor\" data-id=\"703abf5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong> Reference:<\/strong><\/p>\n<ul>\n<li>Nerenz, H, Huppmann, P, Schrader, K (2001). Computer-Supported Formulation of Oxidative Hair Dyes. Cosmet Toil 116(3), 55-59.<\/li>\n<\/ul>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Testing of Application and Dyeing Results &#8211; Hair dyes are tested directly on test subjects or in laboratory tests on hair strands. Trained hairdressers use the products to be tested in the salon and assess&#8230;<\/p>\n","protected":false},"featured_media":24473,"parent":0,"template":"","class_list":["post-25300","praxiswissen","type-praxiswissen","status-publish","has-post-thumbnail","hentry","produktkategorie-hair-care","produktkategorie-hair-colours","leistungen-testing-hair"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Hair Dyes - Institute Dr. Schrader<\/title>\n<meta name=\"description\" content=\"Institute Dr. Schrader - Hair Dyes - Hair dyes are tested directly on test subjects or in laboratory tests on strands of hair.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/schrader-institute.de\/en\/knowledge\/hair-dyes\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hair Dyes - Institute Dr. Schrader\" \/>\n<meta property=\"og:description\" content=\"Institute Dr. Schrader - Hair Dyes - Hair dyes are tested directly on test subjects or in laboratory tests on strands of hair.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/schrader-institute.de\/en\/knowledge\/hair-dyes\/\" \/>\n<meta property=\"og:site_name\" content=\"Institute Dr. Schrader\" \/>\n<meta property=\"article:modified_time\" content=\"2023-08-02T07:41:45+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/schrader-institute.de\/wp-content\/uploads\/2023\/01\/haarfarbe-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t<meta property=\"og:image:height\" content=\"2164\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/schrader-institute.de\\\/en\\\/knowledge\\\/hair-dyes\\\/\",\"url\":\"https:\\\/\\\/schrader-institute.de\\\/en\\\/knowledge\\\/hair-dyes\\\/\",\"name\":\"Hair Dyes - Institute Dr. Schrader\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/schrader-institute.de\\\/en\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/schrader-institute.de\\\/en\\\/knowledge\\\/hair-dyes\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/schrader-institute.de\\\/en\\\/knowledge\\\/hair-dyes\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/schrader-institute.de\\\/wp-content\\\/uploads\\\/2023\\\/01\\\/haarfarbe-scaled.jpg\",\"datePublished\":\"2023-01-24T08:56:11+00:00\",\"dateModified\":\"2023-08-02T07:41:45+00:00\",\"description\":\"Institute Dr. Schrader - Hair Dyes - Hair dyes are tested directly on test subjects or in laboratory tests on strands of hair.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/schrader-institute.de\\\/en\\\/knowledge\\\/hair-dyes\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/schrader-institute.de\\\/en\\\/knowledge\\\/hair-dyes\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/schrader-institute.de\\\/en\\\/knowledge\\\/hair-dyes\\\/#primaryimage\",\"url\":\"https:\\\/\\\/schrader-institute.de\\\/wp-content\\\/uploads\\\/2023\\\/01\\\/haarfarbe-scaled.jpg\",\"contentUrl\":\"https:\\\/\\\/schrader-institute.de\\\/wp-content\\\/uploads\\\/2023\\\/01\\\/haarfarbe-scaled.jpg\",\"width\":2560,\"height\":2164,\"caption\":\"Anwendung und Farbergebnisse auf dem Pr\u00fcfstand\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/schrader-institute.de\\\/en\\\/knowledge\\\/hair-dyes\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Startseite\",\"item\":\"https:\\\/\\\/schrader-institute.de\\\/en\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Hair Dyes\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/schrader-institute.de\\\/en\\\/#website\",\"url\":\"https:\\\/\\\/schrader-institute.de\\\/en\\\/\",\"name\":\"Institute Dr. Schrader\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\\\/\\\/schrader-institute.de\\\/en\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/schrader-institute.de\\\/en\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/schrader-institute.de\\\/en\\\/#organization\",\"name\":\"Institute Dr. Schrader\",\"url\":\"https:\\\/\\\/schrader-institute.de\\\/en\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/schrader-institute.de\\\/en\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/schrader-institute.de\\\/wp-content\\\/uploads\\\/2025\\\/04\\\/Normec_Schrader_Institute_RGB_FC.png\",\"contentUrl\":\"https:\\\/\\\/schrader-institute.de\\\/wp-content\\\/uploads\\\/2025\\\/04\\\/Normec_Schrader_Institute_RGB_FC.png\",\"width\":9981,\"height\":2243,\"caption\":\"Institute Dr. Schrader\"},\"image\":{\"@id\":\"https:\\\/\\\/schrader-institute.de\\\/en\\\/#\\\/schema\\\/logo\\\/image\\\/\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Hair Dyes - Institute Dr. Schrader","description":"Institute Dr. Schrader - Hair Dyes - Hair dyes are tested directly on test subjects or in laboratory tests on strands of hair.","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:\/\/schrader-institute.de\/en\/knowledge\/hair-dyes\/","og_locale":"en_US","og_type":"article","og_title":"Hair Dyes - Institute Dr. Schrader","og_description":"Institute Dr. Schrader - Hair Dyes - Hair dyes are tested directly on test subjects or in laboratory tests on strands of hair.","og_url":"https:\/\/schrader-institute.de\/en\/knowledge\/hair-dyes\/","og_site_name":"Institute Dr. Schrader","article_modified_time":"2023-08-02T07:41:45+00:00","og_image":[{"width":2560,"height":2164,"url":"https:\/\/schrader-institute.de\/wp-content\/uploads\/2023\/01\/haarfarbe-scaled.jpg","type":"image\/jpeg"}],"twitter_card":"summary_large_image","twitter_misc":{"Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/schrader-institute.de\/en\/knowledge\/hair-dyes\/","url":"https:\/\/schrader-institute.de\/en\/knowledge\/hair-dyes\/","name":"Hair Dyes - Institute Dr. Schrader","isPartOf":{"@id":"https:\/\/schrader-institute.de\/en\/#website"},"primaryImageOfPage":{"@id":"https:\/\/schrader-institute.de\/en\/knowledge\/hair-dyes\/#primaryimage"},"image":{"@id":"https:\/\/schrader-institute.de\/en\/knowledge\/hair-dyes\/#primaryimage"},"thumbnailUrl":"https:\/\/schrader-institute.de\/wp-content\/uploads\/2023\/01\/haarfarbe-scaled.jpg","datePublished":"2023-01-24T08:56:11+00:00","dateModified":"2023-08-02T07:41:45+00:00","description":"Institute Dr. Schrader - Hair Dyes - Hair dyes are tested directly on test subjects or in laboratory tests on strands of hair.","breadcrumb":{"@id":"https:\/\/schrader-institute.de\/en\/knowledge\/hair-dyes\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/schrader-institute.de\/en\/knowledge\/hair-dyes\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/schrader-institute.de\/en\/knowledge\/hair-dyes\/#primaryimage","url":"https:\/\/schrader-institute.de\/wp-content\/uploads\/2023\/01\/haarfarbe-scaled.jpg","contentUrl":"https:\/\/schrader-institute.de\/wp-content\/uploads\/2023\/01\/haarfarbe-scaled.jpg","width":2560,"height":2164,"caption":"Anwendung und Farbergebnisse auf dem Pr\u00fcfstand"},{"@type":"BreadcrumbList","@id":"https:\/\/schrader-institute.de\/en\/knowledge\/hair-dyes\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Startseite","item":"https:\/\/schrader-institute.de\/en\/"},{"@type":"ListItem","position":2,"name":"Hair Dyes"}]},{"@type":"WebSite","@id":"https:\/\/schrader-institute.de\/en\/#website","url":"https:\/\/schrader-institute.de\/en\/","name":"Institute Dr. Schrader","description":"","publisher":{"@id":"https:\/\/schrader-institute.de\/en\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/schrader-institute.de\/en\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/schrader-institute.de\/en\/#organization","name":"Institute Dr. Schrader","url":"https:\/\/schrader-institute.de\/en\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/schrader-institute.de\/en\/#\/schema\/logo\/image\/","url":"https:\/\/schrader-institute.de\/wp-content\/uploads\/2025\/04\/Normec_Schrader_Institute_RGB_FC.png","contentUrl":"https:\/\/schrader-institute.de\/wp-content\/uploads\/2025\/04\/Normec_Schrader_Institute_RGB_FC.png","width":9981,"height":2243,"caption":"Institute Dr. Schrader"},"image":{"@id":"https:\/\/schrader-institute.de\/en\/#\/schema\/logo\/image\/"}}]}},"_links":{"self":[{"href":"https:\/\/schrader-institute.de\/en\/wp-json\/wp\/v2\/praxiswissen\/25300","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/schrader-institute.de\/en\/wp-json\/wp\/v2\/praxiswissen"}],"about":[{"href":"https:\/\/schrader-institute.de\/en\/wp-json\/wp\/v2\/types\/praxiswissen"}],"version-history":[{"count":0,"href":"https:\/\/schrader-institute.de\/en\/wp-json\/wp\/v2\/praxiswissen\/25300\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/schrader-institute.de\/en\/wp-json\/wp\/v2\/media\/24473"}],"wp:attachment":[{"href":"https:\/\/schrader-institute.de\/en\/wp-json\/wp\/v2\/media?parent=25300"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}