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Vat dyes are a class of dyes that are classified as such because of the method by which they are applied. Vat dyeing is a process that refers to dyeing that takes place in a bucket or vat. The original vat dye is indigo , once obtained only from plants but now often produced synthetically.
A specialized type of vat dye called Inkodye is also used for sun-printing due to its light-sensitive quality. [2] Unlike other vat dyes which use oxygen to develop their color, Inkodyes are developed by light. [3] These dyes are suspended in leuco form appearing colorless until they are exposed to UV.
Vat Blue 36 is a vat dye that is chemically related to indigo. It is produced by condensation of 4-methyl-5-chloro-7-methoxy-3-indolinone and 5,7–dichloro-3-(2H)-thianaphthenone . [ 1 ]
Direct dyes, a class of dyes largely for dyeing cotton, are water-soluble and can be applied directly to the fiber from an aqueous solution. Most other classes of synthetic dye, other than vat and surface dyes, are also applied in this way. The term may also be applied to dyeing without the use of mordants to fix the dye once it is applied.
Indanthrone is utilized as a blue pigment (C.I. Pigment Blue 60), primarily in the process of vat dyeing, often referred to as C.I. Vat Blue 4. [8] Indanthrone is a vat dye, synthesized to provide highest color fastness for the dyeing and printing of predominantly cellulose-based textile fibers. Fabrics dyed with indanthrene fulfill the highest ...
The California School Food Safety Act, which is a follow-up to the California Food Safety Act and focuses on foods served in schools, will ban red dye No. 40, yellow dyes Nos. 5 and 6, blue dyes ...
However, vat dyes, and especially indigo, must be treated after dyeing by 'soaping' to prevent the dye from rubbing (crocking) off. [5] Vat dyes can be used to simultaneously dye the fabric and to remove underlying fiber-reactive dye (i.e., can dye a black cotton fabric yellow) because of the bleaching action of the reducing bath. The extra ...
A growing body of research has linked artificial food dyes, especially Red No. 40, to a slew of health issues. “There is data in animals that some of these dyes may cause cancer,” Alan says ...