… main stages : (i) Preparation of the paste ( or body ). In some cases (e.g., manufacture of sintered alumina … products are also very often coloured (either in the body or superficially), decorated or glazed by using, as …
… are brown or dark brown. (4) Black earths and natural vandyke brown (Cassel and Cologne earths). Soluble vandyke brown is a prepared pigment which falls in heading …
… soluble in water. Used as a de‑hairing agent in tanning, in dyeing, as a copper absorbent in nickel refining, as a … reducing agent in organic synthesis (preparation of sulphur dyes); in flotation processes; in the preparation of …
