The Manufacture of Lake Pigments from Artificial Colours

The Manufacture of Lake Pigments from Artificial Colours

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1901 edition. Excerpt: ... does not become so readily yellow as is the case when a pure eosine is alone used. Violet lakes, save those derived from gallein, which go brown on treatment with acids, are for the most part derived from methyl violet, which goes blue on treatment with acids. The shade is modified by the addition of rhodamines, magenta, etc., the proportion of which, together with what colour to use, is best determined by comparison with lakes of known composition, as the complications arising from endeavouring to isolate the modifying colour in such mixtures makes it a task of considerable time and patience; and as this class of lakes are not used to any very large extent, the trouble is best met by having a series of modified violets to refer to. A large number of lakes are produced from the various basic blues. These lakes, however, differ but little from each other save in the redness of tone, and to produce a complete series of shades that can be derived from the various basic blues would be a task of considerable magnitude. In this case it is therefore better to try to discover which blue has been used in the production of any particular shade. Those most commonly met with are Nile blue, methylene blue, Basle blue, new bine, water blue, alkali blue; and reference to such a table for the detection of artificial colouring-matters as that published by Lehne & Eusterholze, appearing in the Journal of the Society of Chemical Industry, vol. xiv., would quickly indicate which particular colouring-matter was required to match a given sample. The blues derived from allied alizarine colours are not met with in commerce to any great extent; but those from such colours as the erioglaucines and colours of similar constitution are readily recognised by...
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Product details

  • Paperback | 62 pages
  • 189 x 246 x 3mm | 127g
  • United States
  • English
  • black & white illustrations
  • 1236886607
  • 9781236886606