Congo Red IND Grade Reagent
Brownish red powder. It is soluble in water, ethanol, slightly soluble in acetone, almost insoluble in ether. The maximum absorption wavelength (pH 7.3) is 488 nm (E1%1 cm595). The median lethal dose (rat, vein) is 190 mg/kg.
Acid-base indicator, pH :3.0 (blue-violet) ~ 5.0 (red). The hydrochloric acid and paper acidity in the gastric juice can be measured. Determination of boric acid, cyanide. Additive for biological media. Biological staining, such as embryonic sectioning, plant mucin, cellulose, elastic tissue, etc.
Item of Analysis
pH discoloration domain
Greatest absorption wavelength(λ1,pH6.5)/ nm
Greatest absorption wavelength(λ2,pH8.5)/ nm
Mass absorption coefficient(λ1,pH6.5 dry sample)/(L/cm·g)
Mass absorption coefficient(λ2,pH8.5 dry sample)/(L/cm·g)
Loss on drying,%
Residue on ignition(as SO4),%
Solubility in ethanol
to pass test
Not a hazardous substance or mixture.