Benedikt, Rudolf, 1852-1896, Knecht, Edmund, 1861-1925 · London : G. Bell and Sons · leaf 179
lours produced on cotton, are not so fast as on wool or silk. They are not fast to light. Galle'in and Coerulein. Gallei'n, is obtained by heating phthalic anhy- dride and pyrogallic acid to 190° — 200° till a solid mass is formed. The melt is boiled with water, dissolved in sodium carbonate,… … Gallein, Gallein forms either a brown-red powder or green metallic cr} stals, which are almost insoluble in water, but soluble in alcohol. It is a weak acid, forming a blue solution with alkalies. Its alkaline solution assumes a dirty colour on standing. It dissolves in ammonia with a violet…
Coal-tar colors
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