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Blue-Black Ink

Blue Aleppo galls (free from insect perforations), 4½ ounces; bruised cloves, 1 drachm; cold water, 40 ounces;
purified sulphate of iron, 1½ ounces; pure sulphuric acid (by measure), 35 minims; sulphate of indigo (in the form of
a paste), which should be neutral, or nearly so, 1 ounce. The weights used are avoirdupois, and the measures
apothem caries’. Place the galls, then bruised with the cloves, in a 50 ounce bottle, pour upon them the water, and
digest, often daily shaking for a fortnight. Then filter through paper in another 50 ounce bottle. Get out also the refuse
galls, and wring out of it the remaining liquid through a strong, clean linen or cotton cloth, into the filter, in order that
as little as possible may be lost. Next put in the iron, dissolve completely and filter through paper. Then the acid,
and agitate briskly. Lastly, the indigo, and thoroughly mix by shaking. Pass the whole through paper; just filter out of
one bottle into another until the operation is finished.

Note: - No gum or sugar is proper and on no account must the acid be omitted. When intended for copying, 5½ ounces
 of galls is the quantity. On the large scale this fine ink is made by percolation.