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Food black 2 27755 diazo 2118-39-0: Blue MX-R: Reactive blue 4 61205 anthraquinone 13324-20-4: BODIPY: Dipyrrometheneboron difluoride 138026-71-8: Brazilin/Brazilein: Natural red 24 75280 natural 474-07-7: Brilliant Black BN: Food Black 1 28440 diazo 2519-30-4: Brilliant blue FCF: Erioglaucine FD&C Blue No. 1 Acid blue 9 Food blue 2 42090 ...
(top) a 1,2,3,3-tetramethyl-3H-indolium salt and (bottom) aniline derivative of squaraine dyes. Squaraine dyes are a class of organic dyes showing intense fluorescence, typically in the red and near infrared region (absorption maxima are found between 630 and 670 nm and their emission maxima are between 650–700 nm).
The main advantages of carbonyl dyes are the possibility of reducing the carbonyl groups to water-soluble dienols (→Vat dyes), which is advantageous in industrial applications. On the other hand, by introducing suitable electron donating groups, the absorption maximum of the resulting dyes can be shifted to almost any region of the VIS spectrum.
Sudan stains and Sudan dyes are synthetic organic compounds that are used as dyes for various plastics (plastic colorants) and are also used to stain sudanophilic biological samples, usually lipids. Sudan II , Sudan III , Sudan IV , Oil Red O , and Sudan Black B are important members of this class of compounds (see images below).
Dyes, therefore, must have an affinity for the substance they are intended to color. [4] Chemically speaking, pigments can be organic or inorganic, while dyes are only organic. Furthermore, organic white pigments do not exist, despite the fact that the majority of purified crystalline organic products are white in appearance. [5]
Additionally, the Center for Science in the Public Interest, a consumer food safety organization, was among 24 groups and scientists that joined Consumer Reports in starting a petition in 2022 ...
These same foods are also more likely to contain chemicals and food dyes, some of which may be harmful to your health. ... For example, whole fruits and vegetables, lean proteins, grains, and ...
One other class that describes the role of dyes, rather than their mode of use, is the food dye. Because food dyes are classed as food additives, they are manufactured to a higher standard than some industrial dyes. Food dyes can be direct, mordant and vat dyes, and their use is strictly controlled by legislation.