1,5-Naphthalenedisulfonic acid, commonly known as Armstrong acid, is a fluorescent organic compound with the formula C₁₀H₆(SO₃H)₂. It is one of several isomers of naphthalenedisulfonic acid and is typically obtained as a colorless tetrahydrate solid.
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CAS 81-04-9
Naphthalene-1,5-disulfonic acid tetrahydrate
intermediate for dyes and pigments
1-Naphthalenesulfonic acid, 5-hydroxy-
Dye intermediate for azo dyes
5-aminonaphthalene-1-sulfonic acid
dye intermediate
1-(2,5-Dichloro-4-sulfophenyl)-3-methyl-5-pyrazolone
Dye intermediate
2-Amino-3,5-dimethylbenzenesulfonic acid
Dye intermediate
4-Amino-2,5-dichlorobenzenesulfonic acid
Dye intermediate
3-(Diethylamino)phenol
Dye intermediate
Amsonic acid
chemical intermediate for dyes and fluorescent brighteners
naphthalene-1,5-disulfonic acid
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C1=CC2=C(C=CC=C2S(=O)(=O)O)C(=C1)S(=O)(=O)O