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.
naphthol Yellow is of course a naphthol colour, whilst Vermilline Scarlet is a dye containing both naphthylamine and naphthol.
The substance has the characteristic appearance, odor and taste of naphthol.
Various additions have been made from time to time to the naphthol bath.
When this compound is combined with naphthol diazo-azo dyes are produced.
Resorcine, like naphthol, is insoluble in water, but it can be dissolved by using either soda ash or caustic soda.
So instead of phenol, other coal tar products such as cresol, naphthol or benzene itself may be used.
The compounds formed are brilliant orange dyes, the latter being still largely consumed as “naphthol orange.”
From naphthalene, either naphthylamine (a body like aniline) or naphthol (resembling phenol) may be prepared.
naphthol naph·thol (nāf'thôl', -thōl', nāp'-) or naph·tol (-tôl, -tōl)
An organic compound occurring in two isomeric forms, alpha-naphthol and beta-naphthol. Also called 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.