{"id":341001,"date":"2025-03-05T09:45:00","date_gmt":"2025-03-05T08:45:00","guid":{"rendered":"https:\/\/hunterlab.de\/measuring-the-color-of-nuts\/"},"modified":"2025-10-24T17:58:29","modified_gmt":"2025-10-24T16:58:29","slug":"measuring-the-colour-of-nuts","status":"publish","type":"post","link":"https:\/\/www.hunterlab.eu\/en\/measuring-the-colour-of-nuts\/","title":{"rendered":"Measuring the colour of nuts"},"content":{"rendered":"<p>[et_pb_section fb_built=&#x201D;1&#x2033; _builder_version=&#x201D;4.16&#x2033; global_colors_info=&#x201D;{}&#x201D;][et_pb_row _builder_version=&#x201D;4.16&#x2033; background_size=&#x201D;initial&#x201D; background_position=&#x201D;top_left&#x201D; background_repeat=&#x201D;repeat&#x201D; locked=&#x201D;off&#x201D; global_colors_info=&#x201D;{}&#x201D;][et_pb_column type=&#x201D;4_4&#x2033; _builder_version=&#x201D;4.16&#x2033; custom_padding=&#x201D;|||&#x201D; global_colors_info=&#x201D;{}&#x201D; custom_padding__hover=&#x201D;|||&#x201D;][et_pb_text _builder_version=&#x201D;4.27.4&#x2033; text_font_size=&#x201D;18px&#x201D; header_3_font=&#x201D;||||||||&#x201D; background_size=&#x201D;initial&#x201D; background_position=&#x201D;top_left&#x201D; background_repeat=&#x201D;repeat&#x201D; global_colors_info=&#x201D;{}&#x201D;]<\/p>\n<h2>Color determination of nuts &#x2013; from the raw material to the end product<\/h2>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#x201D;4.27.4&#x2033; text_font_size=&#x201D;18px&#x201D; header_3_font=&#x201D;||||||||&#x201D; background_size=&#x201D;initial&#x201D; background_position=&#x201D;top_left&#x201D; background_repeat=&#x201D;repeat&#x201D; global_colors_info=&#x201D;{}&#x201D;]<\/p>\n<p><img decoding=\"async\" class=\"wp-image-282597 alignright\" src=\"https:\/\/hunterlab.de\/wp-content\/uploads\/2024\/04\/Branchen-Snack-Food-Nuesse-Applikation-2880w.png\" alt=\"Color difference of different nut types\" width=\"450\" height=\"319\"\/>The color of nuts is an important indicator of their quality, freshness and processing. As nuts are a natural product, their color varies depending on the variety, origin, degree of ripeness and storage conditions. Color changes can occur during production and processing for various reasons.<\/p>\n<p>On the one hand, the different types of nuts naturally have different shades of color. For example, hazelnuts are <a class=\"glossaryLink cmtt_Colorimetry\" href=\"https:\/\/www.hunterlab.eu\/en\/glossar\/light\/\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">light<\/a> brown to dark brown, almonds are creamy white without skin or reddish-brown with skin, walnuts can be <a class=\"glossaryLink cmtt_Colorimetry\" href=\"https:\/\/www.hunterlab.eu\/en\/glossar\/light\/\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">light<\/a> brown to dark brown with some gray or black spots, cashews are usually ivory to slightly yellowish.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#x201D;4.16&#x2033; background_size=&#x201D;initial&#x201D; background_position=&#x201D;top_left&#x201D; background_repeat=&#x201D;repeat&#x201D; locked=&#x201D;off&#x201D; global_colors_info=&#x201D;{}&#x201D;][et_pb_column type=&#x201D;4_4&#x2033; _builder_version=&#x201D;4.16&#x2033; custom_padding=&#x201D;|||&#x201D; global_colors_info=&#x201D;{}&#x201D; custom_padding__hover=&#x201D;|||&#x201D;][et_pb_text _builder_version=&#x201D;4.27.4&#x2033; text_font_size=&#x201D;18px&#x201D; header_3_font=&#x201D;||||||||&#x201D; background_size=&#x201D;initial&#x201D; background_position=&#x201D;top_left&#x201D; background_repeat=&#x201D;repeat&#x201D; global_colors_info=&#x201D;{}&#x201D;]<\/p>\n<p>On the other hand, color changes also occur during processing:<\/p>\n<ol>\n<li>Drying\n<ul>\n<li>After harvesting, nuts are often dried to extend their shelf life.<\/li>\n<li>This process can lead to slight darkening, especially when high temperatures are used.<\/li>\n<\/ul>\n<\/li>\n<li>Roasting &#x2013; too <a class=\"glossaryLink cmtt_Colorimetry\" href=\"https:\/\/www.hunterlab.eu\/en\/glossar\/light\/\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">light<\/a> or too dark, too short or too long?\n<ul>\n<li>During roasting, natural sugars in the nuts caramelize, which leads to browning.<\/li>\n<li>Depending on the degree of roasting, the color can vary from <a class=\"glossaryLink cmtt_Colorimetry\" href=\"https:\/\/www.hunterlab.eu\/en\/glossar\/light\/\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">light<\/a> golden to deep brown.<\/li>\n<li>The Maillard reaction (a chemical reaction between amino acids and sugar) also contributes to color intensification.<\/li>\n<\/ul>\n<\/li>\n<li>Seasoning &amp; processing\n<ul>\n<li>Salt, spices or caramel coatings can also change the color.<\/li>\n<li>Honey or sugar glazed nuts often have a darker, shiny layer.<\/li>\n<li>The skin is removed from blanched nuts (e.g. almonds), making them appear lighter in color.<\/li>\n<\/ul>\n<\/li>\n<li>Storage &amp; Oxidation\n<ul>\n<li>Nuts can oxidize over time, especially if they are exposed to <a class=\"glossaryLink cmtt_Colorimetry\" href=\"https:\/\/www.hunterlab.eu\/en\/glossar\/light\/\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">light<\/a>, oxygen or moisture.<\/li>\n<li>This can lead to uneven darkening or the appearance of gray spots, which indicates a loss of quality.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#x201D;4.16&#x2033; background_size=&#x201D;initial&#x201D; background_position=&#x201D;top_left&#x201D; background_repeat=&#x201D;repeat&#x201D; locked=&#x201D;off&#x201D; global_colors_info=&#x201D;{}&#x201D;][et_pb_column type=&#x201D;4_4&#x2033; _builder_version=&#x201D;4.16&#x2033; custom_padding=&#x201D;|||&#x201D; global_colors_info=&#x201D;{}&#x201D; custom_padding__hover=&#x201D;|||&#x201D;][et_pb_text _builder_version=&#x201D;4.27.4&#x2033; text_font_size=&#x201D;18px&#x201D; header_3_font=&#x201D;||||||||&#x201D; background_size=&#x201D;initial&#x201D; background_position=&#x201D;top_left&#x201D; background_repeat=&#x201D;repeat&#x201D; global_colors_info=&#x201D;{}&#x201D;]<\/p>\n<p><strong><img decoding=\"async\" class=\"wp-image-348813 alignleft\" src=\"https:\/\/hunterlab.de\/wp-content\/uploads\/2020\/01\/Aeros_Application_Nuts.png\" alt=\"Aeros with nuts for color determination\" width=\"243\" height=\"244\"\/>Color measurement for quality control of nuts<\/strong><\/p>\n<p>In summary, the color of a nut depends on various factors, from the variety to processing and storage. A uniform, fresh color is generally regarded as a sign of quality and leads to greater consumer acceptance.<\/p>\n<p>Color is an important quality indicator and is measured in the food industry using spectrophotometers. These devices, such as the <a href=\"https:\/\/hunterlab.co.uk\/products\/spectrophotometers\/aeros\/\" target=\"_blank\" rel=\"noopener\">Aeros spectrophotometer<\/a> from HunterLab, enable objective and precise color analysis, even for irregular surfaces such as nuts and other snack foods.<\/p>\n<p>Find out in detail in our application report &#x201C;Color measurement of nuts&#x201D; how manufacturers and producers can ensure the color of nuts, what the challenges are in sample handling and how HunterLab can support you with its product portfolio to determine your product colorimetrically.<\/p>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#x201D;4.27.4&#x2033; text_font_size=&#x201D;18px&#x201D; header_3_font=&#x201D;||||||||&#x201D; background_size=&#x201D;initial&#x201D; background_position=&#x201D;top_left&#x201D; background_repeat=&#x201D;repeat&#x201D; global_colors_info=&#x201D;{}&#x201D;]<\/p>\n<p>&#xA0;<\/p>\n<p><strong>Color measurement of other nut products such as spreads<\/strong><\/p>\n<p><img decoding=\"async\" class=\"wp-image-283266 alignright\" src=\"https:\/\/hunterlab.de\/wp-content\/uploads\/2024\/04\/Farbmessung-von-Apfelmus-2880w.jpg\" alt=\"Color-measurement-of-applesauce\" width=\"304\" height=\"193\"\/>Manufacturers of spreads made from nuts, such as peanut butter, almond butter and other nut butters, face similar challenges. However, as the sample tends to be pasty, i.e. semi-solid and spreadable, but can become more liquid or solid with temperature fluctuations, other quality assurance requirements play a role.<\/p>\n<p>Here, the colorimetry experts at HunterLab recommend either the new compact ColorFlex L2 color measurement device: the cream or paste is spread into a cuvette, placed on the device and measured. Or the Aeros measuring device can also be used here. Depending on the size of the opening of the end product container, the Aeros sensor can measure the sample in its packaging from above without contact.<\/p>\n<p>Our experienced application engineers will advise you on which of the two variants to use. <a href=\"https:\/\/hunterlab.co.uk\/contact-us\/\" target=\"_blank\" rel=\"noopener\">Contact the team at HunterLab Europewe are looking forward to your message!<\/a><\/p>\n<p>[\/et_pb_text][difl_dual_button btn_left_background_bgcolor=&#x201D;#DC4A50&#x2033; use_left_button_icon=&#x201D;off&#x201D; btn_right_background_bgcolor=&#x201D;#FFFFFF&#x201D; use_right_button_icon=&#x201D;off&#x201D; left_button=&#x201D;Talk to us, we will be happy to advise you!&#x201D; left_button_url=&#x201D;@ET-DC@eyJkeW5hbWljIjp0cnVlLCJjb250ZW50IjoicG9zdF9saW5rX3VybF9wYWdlIiwic2V0dGluZ3MiOnsicG9zdF9pZCI6IjM4NTAifX0=@&#x201D; left_button_wrapper_margin=&#x201D;|12px|||false|false&#x201D; right_button_wrapper_margin=&#x201D;|||12px|false|false&#x201D; left_button_padding=&#x201D;16px|24px|16px|24px|true|true&#x201D; left_button_padding_tablet=&#x201D;16px|24px|16px|24px|true|true&#x201D; left_button_padding_phone=&#x201D;16px|16px|16px|16px|true|true&#x201D; left_button_padding_last_edited=&#x201D;on|phone&#x201D; right_button_padding=&#x201D;16px|24px|16px|24px|true|true&#x201D; right_button_padding_tablet=&#x201D;16px|24px|16px|24px|true|true&#x201D; right_button_padding_phone=&#x201D;16px|16px|16px|16px|true|true&#x201D; right_button_padding_last_edited=&#x201D;on|phone&#x201D; alignment=&#x201D;left&#x201D; alignment_tablet=&#x201D;center&#x201D; alignment_phone=&#x201D;center&#x201D; alignment_last_edited=&#x201D;on|tablet&#x201D; _builder_version=&#x201D;4.25.2&#x2033; _dynamic_attributes=&#x201D;left_button_url&#x201D; _module_preset=&#x201D;be95d251-2d55-4926-b8b4-f039f8b01275&#x2033; left_button_font=&#x201D;|700|||||||&#x201D; left_button_text_color=&#x201D;#FFFFFF&#x201D; left_button_font_size=&#x201D;16px&#x201D; left_button_line_height=&#x201D;22px&#x201D; right_button_font=&#x201D;Nunito Sans|700|||||||&#x201D; right_button_text_color=&#x201D;#E63D28&#x2033; right_button_font_size=&#x201D;16px&#x201D; right_button_line_height=&#x201D;22px&#x201D; custom_margin=&#x201D;20px||||false|false&#x201D; left_button_text_align_tablet=&#x201D;&#x201D; left_button_text_align_phone=&#x201D;center&#x201D; left_button_text_align_last_edited=&#x201D;on|phone&#x201D; left_button_font_size_tablet=&#x201D;16px&#x201D; left_button_font_size_phone=&#x201D;14px&#x201D; left_button_font_size_last_edited=&#x201D;on|phone&#x201D; left_button_line_height_tablet=&#x201D;22px&#x201D; left_button_line_height_phone=&#x201D;20px&#x201D; left_button_line_height_last_edited=&#x201D;on|phone&#x201D; right_button_font_size_tablet=&#x201D;16px&#x201D; right_button_font_size_phone=&#x201D;14px&#x201D; right_button_font_size_last_edited=&#x201D;on|phone&#x201D; right_button_line_height_tablet=&#x201D;22px&#x201D; right_button_line_height_phone=&#x201D;20px&#x201D; right_button_line_height_last_edited=&#x201D;on|phone&#x201D; border_radii_left_button=&#x201D;on|4px|4px|4px|4px&#x201D; border_width_all_left_button=&#x201D;2px&#x201D; border_color_all_left_button=&#x201D;#DC4A50&#x2033; border_radii_right_button=&#x201D;on|4px|4px|4px|4px&#x201D; locked=&#x201D;off&#x201D; global_colors_info=&#x201D;{}&#x201D; btn_left_background_bgcolor__hover_enabled=&#x201D;on|desktop&#x201D; btn_left_background_bgcolor__hover=&#x201D;#FFFFFF&#x201D; left_button_text_color__hover_enabled=&#x201D;on|hover&#x201D; left_button_text_color__hover=&#x201D;#dc4a50&#x2033; btn_right_background_bgcolor__hover_enabled=&#x201D;on|desktop&#x201D; btn_right_background_bgcolor__hover=&#x201D;#E63D28&#x2033; right_button_text_color__hover_enabled=&#x201D;on|hover&#x201D; right_button_text_color__hover=&#x201D;#FFFFFF&#x201D;][\/difl_dual_button][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>For snack food, it is important to ensure that the instrument has a large observation area, as this allows the sample to be easily placed under the sensor in different sized sample plates or in a Petri dish.<\/p>\n","protected":false},"author":2,"featured_media":340238,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"<img src=\"https:\/\/layouts.diviflash.xyz\/logistics\/wp-content\/uploads\/sites\/29\/2022\/12\/plane-trucks-are-flying-towards-destination-with-brightest-3d-rendering-illustration-1-scaled-1.jpg\" alt=\"\" width=\"2560\" height=\"1225\" class=\"size-full wp-image-1855\" \/> \r\n\r\nOur airfreight staff attaches great importance to customizing the booking process for our customers. That\u2019s why we strive to find the air freight solution that best suits your needs. We\u2019ll ask you when the freight is available, best suits your needs. We\u2019ll ask you when the freight is available, what the required delivery date is, and best suits your needs. We\u2019ll ask you when the freight is available,\r\n\r\nbottlenecks. In 2019, 2.2 million electric cars 1 were sold, representing just 2.5% of global car sales. In 2020, the overall car market contracted but electric car sales bucked the trend, rising million and representing 4.1% of total car sales.\r\n\r\n\u00a0\r\n<blockquote class=\"featured-project-quote\">\u201cAnd the day came when the risk to remain tight in a bud was more painful than the risk it took to blossom.\u201d\r\n\r\n<cite>Tomas Reuss<\/cite><\/blockquote>\r\n<h2><\/h2>\r\n<h2>Context switch to boost productivity<\/h2>\r\nbottlenecks. In 2019, 2.2 million electric cars 1 were sold, representing just 2.5% of global car sales. In 2020, the overall car market contracted but electric car sales bucked the trend, rising million and representing 4.1% of total car sales.\r\n\r\nbottlenecks. In 2019, 2.2 million electric cars 1 were sold, representing just 2.5% of global car sales. In 2020, the overall car market contracted but electric car sales bucked the trend, rising million and representing 4.1% of total car sales.\r\n\r\nbottlenecks. In 2019, 2.2 million electric cars 1 were sold, representing just 2.5% of global car sales. In 2020, the overall car market contracted but electric car sales bucked the trend, rising million and representing 4.1% of total car sales.<img src=\"https:\/\/layouts.diviflash.xyz\/logistics\/wp-content\/uploads\/sites\/29\/2022\/12\/theme_image_08-300x200.jpg\" alt=\"\" width=\"300\" height=\"200\" class=\"alignright size-medium wp-image-1646\" \/>\u00a0bottlenecks. In 2019, 2.2 million electric cars 1 were sold, representing just 2.5% of global car sales. In 2020, the overall car market contracted but electric car sales bucked the trend, rising million and representing 4.1% of total car sales.\r\n\r\nbottlenecks. In 2019, 2.2 million electric cars 1 were sold, electric representing just 2.5% of global car sales. In 2020, the overall car market contracted but electric car sales bucked the trend, rising a to 3 million and representing 4.1% of total car sales. of global car sales. In 2020, the overall a market contracted but electric car sales bucked the trend, rising to 3 million and representing electric bottlenecks. In 2019, 2.2 million electric cars 1 were sold, representing just 2.5% of in global car sales. In 2020, the overall car market contracted but electric car sales bucked the a trend, rising to 3 million and representing 4.1% of total car sales.\r\n\r\n\u00a0\r\n\r\n\r\n<img src=\"https:\/\/layouts.diviflash.xyz\/logistics\/wp-content\/uploads\/sites\/29\/2022\/12\/interior-large-distribution-warehouse-with-shelves-stacked-with-palettes-goods-ready-market.jpg\" alt=\"\" width=\"856\" height=\"482\" class=\"alignnone size-full wp-image-1647\" \/>bottlenecks. In 2019, 2.2 million electric cars 1 were sold, representing just 2.5% of global car sales. In 2020, the overall car market contracted but electric car sales bucked the trend, rising million and representing 4.1% of total car sales.\r\n\r\nbottlenecks. In 2019, 2.2 million electric cars 1 were sold, representing just 2.5% of global car sales. In 2020, the overall car market contracted but electric car sales bucked the trend, rising million and representing 4.1% of total car sales. bottlenecks. In 2019, 2.2 million electric cars were sold, representing just 2.5% of global car sales. In 2020, the overall car market contract electric car sales bucked the trend, rising to 3 million.","_et_gb_content_width":"","footnotes":""},"categories":[806],"tags":[1121,1143,876],"class_list":["post-341001","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-colorimetry","tag-aeros-en","tag-nuts","tag-snack-food-en"],"_links":{"self":[{"href":"https:\/\/www.hunterlab.eu\/en\/wp-json\/wp\/v2\/posts\/341001","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hunterlab.eu\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.hunterlab.eu\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.hunterlab.eu\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hunterlab.eu\/en\/wp-json\/wp\/v2\/comments?post=341001"}],"version-history":[{"count":0,"href":"https:\/\/www.hunterlab.eu\/en\/wp-json\/wp\/v2\/posts\/341001\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.hunterlab.eu\/en\/wp-json\/wp\/v2\/media\/340238"}],"wp:attachment":[{"href":"https:\/\/www.hunterlab.eu\/en\/wp-json\/wp\/v2\/media?parent=341001"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.hunterlab.eu\/en\/wp-json\/wp\/v2\/categories?post=341001"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hunterlab.eu\/en\/wp-json\/wp\/v2\/tags?post=341001"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}