Scientific American 9, 28.2.1863
J. Ingham and W. P. Wood, of England, manufacture a blue color from any red aniline dye, by mixing the latter with caustic soda and subjecting it to a high heat in a sealed tube. The red color is gradually converted into a blue solution by this treatment. To render it fit for coloring silk, wool and cotton, the blue color thus obtained is dissolved in alcohol.
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