Naphthol Green B
Naphthol Green B in solid form and as aqueous solution.
| IUPAC name
Trisodium iron(III) 5-nitroso-6-oxidonaphthalene-2-sulfonate
| Other names
Acid green 1
D and C Green 1
|Molar mass||878.45 g/mol|
|Appearance||Dark green powder|
|Solubility|| Moderate soluble in aq. ammonia 25%, formic acid, HCl 37%, methanol|
Insoluble in acetic acid, acetone, acetonitrile, chloroform, dichloromethane, ethanol, hexane, isobutanol, isopropanol, toluene, xylene
|Safety data sheet||Santa Cruz Biotechnology|
|Lethal dose or concentration (LD, LC):|
LC50 (Median concentration)
|1.000 mg/l (fish, Oryzias latipes)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Naphthol Green B is a nitroso dye, sodium salt of Naphthol Green Y, with the chemical formula C30H15FeN3Na3O15S3.
Naphthol Green B dissolves in water, forming a green solution.
Naphthol Green B is a dark green or black-green solid, soluble in water. It is moderate soluble in some polar solvents, such as formic acid, hydrochloric acid, methanol, but insoluble in non-polar solvents, as well as glacial acetic acid. In hydrochloric acid it dissolves, turning yellow, due to the formation of iron chlorides.
Naphthol Green B is sold by various chemical suppliers. While there don't appear to be sellers on eBay, there are several on Amazon.
Naphthol Green B is much cheaper to buy than synthesize.
- Stain collagen
Naphthol Green B may stain green, so proper protection should be worn.
It is not classified as hazardous substance or mixture according to Regulation (EC) No. 1272/2008.
In closed bottles, away from corrosive vapors.
Naphthol Green B can be neutralized with a strong oxidizing solution, such as chromic acid, Fenton's reagent or piranha solution, followed by neutralization of the leftover oxidizing agent and then poured down the drain. Since most of the Naphthol Green B neutralized this way is either as solution or traces, there is little risk of splashing.