Reducible and reoxidisable dyestuffs

Reduction with stannous chloride and hydrochloric acid pio ceeds easily in the cold. [Pg.435]

Reduction with stannous chloride and hydro chloric acid takes place with difficulty and ouly in the hot A zincs. [Pg.435]

The colouring matter does not contain sulphur and Is of basic or phenolic character Inda mines, indophenols, oxasincs. [Pg.435]

The colouring matter contains sulphur (not sulpbonic) and Is bask, acid phenolic or acid Thiazincs. [Pg.435]

Ether extracts the colouring matter from its slightly alkaline aqueous or aqueous-alcoholic solution, the ethereal layer when shaken with acetic acid, turns [Pg.436]