The Painter's & Colourman's Complete Guide ... Third Edition [of the Painting Section of “The Painter's and Varnisher's Guide”], Corrected and Improved by a Practical Chemist. [The Editor's Preface Signed: J. J.]
... wash the pigment . Or , Take sulphate of copper one pound ; alum , or Epsom salt , one pound ; dissolve these in two quarts of water , and filter . Add subcarbonate of potash sufficient to precipitate the pigment ; wash it thoroughly ...
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![The Painter's & Colourman's Complete Guide ... Third Edition [of the Painting Section of “The Painter's and Varnisher's Guide”], Corrected and Improved by a Practical Chemist. [The Editor's Preface Signed: J. J.]](/images/5x1dAAAAcAAJ.jfif)