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[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 articles, and some foods.
Acid dyes can also be used as food colouring, helping to increase the attractiveness of certain foods, and thus becoming more appealing to customers. Some examples include erythrosine, tartrazine, sunset yellow and allura red, to name a few, many of which are azo dyes. [12] These dyes can be used in frosting, cookies, bread, condiments or drinks.
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 ...
Download as PDF; Printable version; In other projects Wikimedia Commons; Wikidata item; Appearance. ... Azo dyes are dyes with R-N=N-R azo structure as a chromophore.
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 ...
Azobenzene is a photoswitchable chemical compound composed of two phenyl rings linked by a N=N double bond.It is the simplest example of an aryl azo compound.The term 'azobenzene' or simply 'azo' is often used to refer to a wide class of similar compounds.
Examples of acid dye are Alizarine Pure Blue B, Acid red 88, etc. Basic dyes are water-soluble cationic dyes that are mainly applied to acrylic fibers, but find some use for wool and silk. Usually acetic acid is added to the dye bath to help the uptake of the dye onto the fiber. Basic dyes are also used in the coloration of paper.
In 1858 Peter Griess passed ‘nitrous fumes’ (N 2 O 3) into a solution of picramic acid (2-amino-4,6-dinitrophenol) and isolated a product belonging to a new class of compounds: azo dyes. Later, a new class of azo dyes that were based on "coupling" reactions entered the market. The new azo dyes were easy to make and assumed a vast variety of ...