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Alizarin Blue
In 20 parts of fuming sulphuric acid dissolve 5 parts of indigo, and to the
solution add 100 parts of extract of aqueous myrobalous and 10.5 parts iron
filings or turning shavings. Finally add:
Gum
Arabic
....
.. 1.5 parts
Sugar
..... 7.5 parts
Sulphuric acid, 66° B
...
... 10.5 parts
Aniline blue
....... 1.5 parts
Carbolic acid
..... 0.5 parts
Myrobalan extract to make.... 1,000 parts
This ink when first
used has a bluish tint, afterwards becoming black.
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