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Drying colored cloth Chemical structure of indigo dye, the blue coloration of blue jeans. Although once extracted from plants, indigo dye is now almost exclusively synthesized industrially. [1] A dye is a colored substance that chemically bonds to the material to which it is being applied.
This is a list of dyes with Colour Index International generic names and numbers and CAS Registry numbers. This list is incomplete; you can help by adding missing items.
Hofmann showed that toluidine must be present to make these dyes. Aniline dyes, including mauve, are prepared from aniline-containing amounts of toluidine. [19] One can also classify dyes based on chemical formulas, azo-dyes from coupling, or diazonation—reactions with a characteristic azo group. [27]
The majority of plant dyes, however, also require the use of a mordant, a chemical used to "fix" the color in the textile fibres. These dyes are called adjective dyes or "mordant dyes". By using different mordants, dyers can often obtain a variety of colors and shades from the same dye, as many mordants not only fix the natural dye compounds to ...
Dyeing is normally done in a special solution containing dyes and particular chemical material. Dye molecules are fixed to the fiber by absorption, diffusion, or bonding with temperature and time being key controlling factors. The bond between the dye molecule and fiber may be strong or weak, depending on the dye used.
There’s an absolute frenzy about this "cancer-causing chemical" on social media, which is a win for anti-food-dye advocates and the advocacy groupp Centre for Science in the Public Interest ...
Aluminum pigments. Ultramarine (PB29): a synthetic or naturally occurring sulfur containing silicate mineral - Na 8–10 Al 6 Si 6 O 24 S 2–4 (generalized formula); Persian blue: made by grinding up the mineral Lapis lazuli.
In the United States, Kellogg's Froot Loops uses food colorings (Red Dye No. 40, Yellow Dye No. 5, Yellow Dye No. 6, Blue Dye No. 1) and butylated hydroxytolune (BHT), which is a lab-made chemical ...