A Practical Treatise On the Manufacture of Colors for Painting Comprising the O
A Practical Treatise On the Manufacture of Colors for Painting Comprising the O
Jean Ren Denis Riffault Des Htres
The book A Practical Treatise On the Manufacture of Colors for Painting Comprising the O was written by author Jean Ren Denis Riffault Des Htres Here you can read free online of A Practical Treatise On the Manufacture of Colors for Painting Comprising the O book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Practical Treatise On the Manufacture of Colors for Painting Comprising the O a good or bad book?
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In thi* operation, it is not necessary to watch the bluing with the same attention as when the aqua regia ii used, because an excess of perchloride does not altei the purity of the color. This perchloride of iron is BLUE COLORS. 251 therefore added to a slight excess, that is, until a filtered sample of the liquor is turned decidedly blue by a few drops of a solution of ferrocyanide of potas- sium. When this point is reached, the liquor is filtered out (if it be desired to save nearly all of it...), or the precipitate is left to settle, and the clear portion is decanted. " This liquor, as we have said, is a solution mostly of protochloride of iron. It is poured upon old scrap iron, and may be used instead of sulphate of iron for a precipitation with ferrocyanide of potassium. This saving is one advantage of this method. " The color is washed, etc. , in the ordinary manner. "Third Process. In this method, the white precip- itate is rendered blue by a solution of perchloride of manganese. The economy of the process depends on local circumstances, and on this account, it is neces- sary to state that the price of manganese ore is based upon its yield in binoxide, and that the less oxidized ores generally mixed with it may be dissolved in cold hydrochloric acid.
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