Half a pint of good beer.
Two ounces of galls.
Half an ounce of copperas.
Ditto of gum Arabic.
Quarter of an ounce of rock alum.
It will never mould or lose its substance or colour. The large quantity
will bear half as much beer for future use. If it thickens, thin it with
beer.
I adopt the Italian ladies' method of keeping the roving of a bit of silk
stocking in the glass, which the pen moving, preserves the consistency of
the liquid and keeps the fingers from it.