Silicious Lac Dyes.

Practical Magazine 20, 1876

(Chemistry applied to the Arts, Manufactures, &c.
Dyeing, Calico Printing, Bleaching, Tanning, and Allied Subjects.)

It is known that if a solution of alumina is poured into solutions of various colouring matters, all the colour is precipitated in forms to which the name of "lacs" has been given. M. R. BÖTTGER states that when an alcoholic solution of any of the colours which are extracted from tar is mixed with a sufficient quantity of "fossil meal," or infusorial earth, one need only add water and filter the mixture, for the liquid to flow clear while the earth retains all the colour. It is probable that in this way silicious lacs capable of being applied to many purposes might be obtained at a low price.

- Technologiste, June 17, 1876.

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