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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.
Broadly, dyes are soluble and become fixed to a substrate via impregnation, while pigments are insoluble and require a binding agent to adhere to a substrate. 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.
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A dye is a colored substance that chemically bonds to the substrate to which it is being applied. This distinguishes dyes from pigments which do not chemically bind to the material they color. Dye is generally applied in an aqueous solution and may require a mordant to improve the fastness of the dye on the fiber. [2]
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.
The Marburg virus, which causes bleeding from the eyes, nose, and mouth, can be fatal in up to 90% of those infected
Vat Yellow 1 is a vat dye, yellow in appearance under some conditions used in cloth dyeing. [1] Its synonyms are flavanthrone and Indofast Yellow, and it is in the class of anthraquinone -type compounds.
Kario Oquendo hit four 3-pointers and scored 20 points on 7-of-8 shooting Tuesday night to lead seven SMU players scoring in double figures and help the Mustangs beat Alabama State 101-72. Chuck ...