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Blue Indelible Ink
This ink has the
reputation of resisting not only water and oil, but alcohol, oxalic acid,
alkalies, the chlorides, etc.
it is prepared as follows: Dissolve 4 parts of
gum lac in 36 parts of boiling water carrying 2 parts of borax.
Filter and
set aside. Now dissolve 2 parts of gum Arabic in 4 parts of water and add
the solution to the filtrate.
Finally, after the solution is quite cold, add
2 parts of powdered indigo and dissolve by agitation. Let stand for
several
hours, then decant, and put in small bottles.
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