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Rufigallic Red








When a duly proportioned mixture of gallic acid and oil of vitriol is
carefully and gradually heated to 140 deg., a viscid wine-red liquid
results. If this be poured into cold water, after cooling, a heavy
brown-red granular precipitate is formed, soluble in 3333 parts of
boiling water. It dissolves in potash-ley, and to fabrics impregnated
with alum or iron mordants, imparts the same shades of colour as madder;
the colours so produced withstanding soap but not chlorine.

Whether brilliant lakes could be obtained from the potash solution of
the red, and whether those reds would be stable, it might be worth while
to ascertain.





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