AdministratorWhat is para red used for?
Para Red is a biological stain. It is used as a fat soluble chemical dye and food additive. It is a banned colorant and a number of analytical techniques have been developed to detect it in food.
Why is para red red?
Chemically, it is similar to Sudan I. It was discovered in 1880 by von Gallois and Ullrich and was the first azo dye. It dyes cellulose fabrics a brilliant red color, but is not very fast. The dye can be washed away easily from cellulose fabrics if not dyed correctly….Para red.
| Names | |
|---|---|
| Hazard statements | H315 , H319 , H335 |
Is Para Red Toxic?
Sudan azo dyes have genotoxic effects and ingestion of food products contaminated with Sudan I, II, III, IV, and Para Red could lead to exposure in the human gastrointestinal tract.
How is para red made?
Para red was first synthesized in 1880 by Holliday in England. The dye is made by reacting beta-naphthol with Paranitroaniline, a coal-tar derivative. Different shades are obtained by varying temperature and pH of the mixture. Para reds have fair lightfastness and are not used in artists paints because of bleeding.
What is Congo red dye?
Congo Red is the sodium salt of benzidinediazo-bis-1-naphthylamine-4-sulfonic acid; a diazo dye that is red in alkaline solution and blue in acid solution and used especially as an indicator and as a biological stain. NCI Thesaurus (NCIt) Congo Red is an indicator dye that is blue-violet at pH 3.0 and red at pH 5.0.
Are azo dyes safe to use?
Safety and regulation Many azo pigments are non-toxic, although some, such as dinitroaniline orange, ortho-nitroaniline orange, or pigment orange 1, 2, and 5 are mutagenic and carcinogenic. Azo dyes derived from benzidine are carcinogens; exposure to them has classically been associated with bladder cancer.
What is the name for red azo dye?
The IUPAC name for red azo dye is p-N, N-dimethyl amino azo benzene.
What is the chemical name of Para?
1,4-Dichlorobenzene (1,4-DCB, p-DCB, or para-dichlorobenzene, sometimes abbreviated as PDCB or para) is an organic compound with the formula C6H4Cl2. This colorless solid has a strong odor.