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Azo dyes are synthetic dyes and do not occur naturally. [2] [3] Most azo dyes contain only one azo group but there are some that contain two or three azo groups, called "diazo dyes" and "triazo dyes" respectively. Azo dyes comprise 60–70% of all dyes used in food and textile industries. [3] Azo dyes are widely used to treat textiles, leather ...
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Therefore, they are used as dyes, and are commonly known as azo dyes, an example of which is Disperse Orange 1. Some azo compounds, e.g., methyl orange, are used as acid-base indicators due to the different colors of their acid and salt forms. Most DVD-R/+R and some CD-R discs use blue azo dye as the recording layer. The commercial success of ...
Azo-eosin Azoeosin G Acid red 4 14710 azo 5858-39-9: Azo Fuchsine 6B Acid violet 7 18055 azo 4321-69-1: Azophloxine: Red 2G Azogeranin B Amidonaphthol red G Acid red 1 Food red 10 18050 azo 3734-67-6: Azorubine: Acid red 14 Food red 3 14720 azo 3567-69-9: Azo violet: Magneson I azo 74-39-5: Azure A: Methylene azure A 52005 thiazin 531-53-3 ...
Allura Red AC, also known as FD&C Red 40 or E129, is a red azo dye commonly used in food. It was developed in 1971 by the Allied Chemical Corporation, who gave the substance its name.
The point of the ester group is controlled by choosing a azo dye with a different alcohol group position. Either the dye or the sugar is reacted with succinic anhydride. This forms an amide group with the sugar or an ester group with the dye. The free carboxylic acid may then react with the alcohol group or amine group on the corresponding dye ...
These azo compounds are considered as derivatives of diazene (diimide), [4] and are sometimes referred to as 'diazenes'. The diazenes absorb light strongly and are common dyes. [5] Different classes of azo dyes exist, most notably the ones substituted with heteroaryl rings. [6]
Alizarine Yellow R is a yellow colored azo dye made by the diazo coupling reaction. It is usually commercially available as a sodium salt. In its pure form, it is a rust-colored solid. [2] It is mainly used as a pH indicator.