- either of two isomeric hydroxyl derivatives, C10H7OH, of naphthalene (alpha-naphthol or 1-naphthol and beta-naphthol or 2-naphthol), white or yellowish crystals, with a phenolic odor, that darken on exposure to light: used chiefly in dyes, drugs, perfumes, and insecticides.
Origin of naphthol
Examples from the Web for naphthol
Historical Examples of naphthol
Various additions have been made from time to time to the naphthol bath.
When a good method for making the naphthol was discovered in 1869, the dye was made from this.
Both the formaldehyde and the naphthol exercise tanning actions, but the process is not used in practise.Principles and Practice of Fur Dressing and Fur Dyeing
William E. Austin
The compounds formed are brilliant orange dyes, the latter being still largely consumed as “naphthol orange.”
When this compound is combined with naphthol diazo-azo dyes are produced.
- a white crystalline solid having two isomeric forms, alpha-naphthol, used in dyes, and beta-naphthol, used in dyes and as an antioxidant. Formula: C 10 H 7 OH
Word Origin for naphthol
naphthol(năf′thôl′, -thōl′, năp′-)
- An organic compound occurring in two isomeric forms, alpha-naphthol and beta-naphthol.naphthalenol
- A poisonous organic compound occurring in two isomeric forms. Both isomers are important in the manufacture of dyes, and also in making antiseptics, insecticides, and tanning agents. Naphthol consists of a hydroxyl group (OH) attached to naphthalene. Chemical formula: C10H8O.