Benedikt, Rudolf, 1852-1896, Knecht, Edmund, 1861-1925 · London : G. Bell and Sons · leaf 247
of commercial alizarin-orange. For the preparation of this colouring matter, alizarin (blue shade) is treated in solution or in a finely divided state with nitrous fumes. The raw product is purified by dissolving it in sodium carbonate, filtering and precipitating again with an acid. If… … iS Nitro-alizarin. C CO c Purpurin. Pure nitro-alizarin forms yellow needles or leaflets which melt at 244^. At a higher temperature it subli- mates with partial decomposition. It possesses stronger acid properties than alizarin. Nitro-alizarin is almost insoluble in water, but will dissolve in…
Coal-tar colors
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