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a colorless, crystalline, dihydroxyl derivative of benzene, C 6 H 6 O 2 , the ortho isomer, used chiefly in photography, for dyeing, and as a reagent; pyrocatechol.
Historical Examples

catechol tans, often obtained from barks, contain usually about 60 per cent.
Animal Proteins Hugh Garner Bennett

Tanning materials are divided into two main classes: Pyrogallol, catechol.
Leather K. J. Adcock

These skins are tanned with turwar bark, which contains a catechol tannin.
Animal Proteins Hugh Garner Bennett

The other is called the catechol group and is strongly condemned.
Library Bookbinding Arthur Low Bailey

It is particularly advantageous to blend judiciously the two main types of material, the pyrogallol and catechol tans.
Animal Proteins Hugh Garner Bennett

The tannins are classified into “pyrogallol tans” and “catechol tans,” according to the parent phenol.
Animal Proteins Hugh Garner Bennett

Generally, the best mixed tannages for solid leather consist of a combination of both pyrogallol and catechol tannins.
Leather K. J. Adcock

Like all catechol tans, the resulting leather darkens on exposure to sunlight.
Animal Proteins Hugh Garner Bennett

It is a catechol tan of peculiarly mellow quality and great practical value.
Animal Proteins Hugh Garner Bennett

Xanthin and catechol browns are pleasing in appearance, but their effect is less rich than that obtained with potash.
The Decoration of Leather Georges de Rcy

noun
a colourless crystalline phenol found in resins and lignins; 1,2-dihydroxybenzene. It is used as a photographic developer. Formula: C6H4(OH)2 Also called pyrocatechol

catechol cat·e·chol (kāt’ĭ-kôl’, -kōl’)
n.
See pyrocatechol.
catechol
(kāt’ĭ-kôl’, -kōl’)
A biologically important organic phenol occurring naturally in lignins and resins. It has two hydroxyl groups attached to a benzene ring. Catechol is very caustic and is used in dyeing and as a photographic developer and an antiseptic. Chemical formula: C6H6O2.