3761-53-3 Usage
Description
ACID RED 26, also known as an acid azo red dye, is an organic sodium salt that is the disodium salt of 4-[(2,4-dimethylphenyl)diazenyl]-3-hydroxynaphthalene-2,7-disulfonic acid. It is characterized by its dark red to bordeaux fine powder appearance and is soluble in water, hardly soluble in ethanol and acetone, and insoluble in other organic solvents. ACID RED 26 exhibits various color changes when interacting with different chemicals, such as a wine red color in strong sulfuric acid and a bright red to orange color when mixed with nitric acid.
Uses
ACID RED 26 has a variety of applications across different industries, primarily due to its vibrant red color and chemical properties.
Used in Histology:
ACID RED 26 is used as a stain in histology, specifically in Masson's trichrome stain, where it provides a slight orange shading to the red of the cytoplasmic structure. This staining property is crucial for the accurate identification and analysis of cellular structures in various biological samples.
Used in Inks and Fabrics:
ACID RED 26 is also utilized as a dye in the ink and fabric industries, contributing to the vibrant red colors in these products. However, it is important to note that the use of ACID RED 26 in these applications can lead to environmental pollution and the presence of textile effluents. As a result, it is listed as an environmental toxin on the US EPA Toxic Release Inventory (TRI) list.
Environmental Testing:
Due to its potential environmental impact, ACID RED 26 is also used in environmental testing to assess the presence and effects of this dye in various ecosystems.
The properties and applications of ACID RED 26 are further characterized by its standard and fastness ratings, as follows:
Light Fastness: ISO 3, AATCC 4
Soaping: ISO 3-4, AATCC 2
Perspiration Fastness: ISO 5, AATCC 2
Oxygen Bleaching: ISO 4, AATCC 1-2
Fastness to Seawater: ISO 1, AATCC 1-2
These ratings indicate the dye's performance and stability under various conditions, such as exposure to light, water, and other environmental factors.
Preparation
2,4-Dimethylbenzenamine diazo, coupled with 3-Hydroxynaphthalene-2,7-disulfonic acid.
Air & Water Reactions
Azo dyes can be explosive when suspended in air at specific concentrations. Slightly soluble in water.
Reactivity Profile
ACID RED 26 is an azo compound. Azo, diazo, azido compounds can detonate. This applies in particular to organic azides that have been sensitized by the addition of metal salts or strong acids. Toxic gases are formed by mixing materials of this class with acids, aldehydes, amides, carbamates, cyanides, inorganic fluorides, halogenated organics, isocyanates, ketones, metals, nitrides, peroxides, phenols, epoxides, acyl halides, and strong oxidizing or reducing agents. Flammable gases are formed by mixing materials in this group with alkali metals. Explosive combination can occur with strong oxidizing agents, metal salts, peroxides, and sulfides. ACID RED 26 is incompatible with strong oxidizing agents and strong acids .
Fire Hazard
Flash point data for ACID RED 26 are not available; however, ACID RED 26 is probably combustible.
Safety Profile
Moderately toxic by
intraperitoneal route. Questionable
carcinogen with experimental carcinogenic
and tumorigenic data. Mutation data
reported. When heated to decomposition it
emits toxic fumes of NOx and SOx.
Standard
Light Fastness
Fading
Stain
ISO
3
AATCC
4
Check Digit Verification of cas no
The CAS Registry Mumber 3761-53-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 3,7,6 and 1 respectively; the second part has 2 digits, 5 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 3761-53:
(6*3)+(5*7)+(4*6)+(3*1)+(2*5)+(1*3)=93
93 % 10 = 3
So 3761-53-3 is a valid CAS Registry Number.
InChI:InChI=1/C18H16N2O7S2.2Na/c1-10-3-6-15(11(2)7-10)19-20-17-14-5-4-13(28(22,23)24)8-12(14)9-16(18(17)21)29(25,26)27;;/h3-9,21H,1-2H3,(H,22,23,24)(H,25,26,27);;/q;2*+1/p-2/b20-19+;;
