Crimson clover though usually grown for the enrichment of soils will not, as a rule, make satisfactory growth on soils very low in the elements of fertility, whatsoever may be their composition or texture. On orchard lands liberally fertilized,... Read more of Soils at Clovers.caInformational Site Network Informational
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Cotton Seed Blue

Cotton seed oil is bleached by treatment with either carbonate of soda
or caustic lime. In both cases, a considerable residue is left after
drawing off the bleached oil. This residue is treated with sulphuric
acid, and distilled at a high temperature, when there is left a compact
mass of a deep greenish-blue colour. On further treatment of this mass
with strong sulphuric acid, the green tint disappears, and a very
intense pure blue colour is produced. The blue mass is a mixture of the
coloured substance with some sulphuric acid, sulphate of soda, and fats.
The two former may be removed by washing with water; the latter by
treatment with naptha. Alcohol now dissolves the blue colour, and water
precipitates it from the solution chemically pure.

This blue has not been introduced as a pigment; and of its permanence,
and other attributes, we know nothing.

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Previous: Schweinfurt Blue

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