powdered dragon's blood are
digested with 26 ozs. of strong spirits of wine in a corked bottle, and
left in a moderately warm place for four days. The solution is then
filtered off, and the clear filtrate is ready for use. The wood which is
to be stained is first passed through nitric acid, then dried, painted
over with the alcoholic extract, dried, oiled and polished. Dark
Walnut.--3 ozs. permanganate of potash are dissolved in six pints of
water, and the wood is painted twice with this solution. After five
minutes the wood is washed, and grained with acetate of iron (the
ordinary iron liquor of the dyer) at 20i Tw. Dry, oil and polish as
usual. Gray--1 oz. nitrate of silver is dissolved in 45 ozs. water, and
the wood painted twice with the solution; afterwards the wood is
submitted to the action of hydrochloric acid, and finally washed with
ammonia. It is then dried in a dark place, oiled and polished. This is
said to give remarkably good results on beech, pitch pine and poplar.
Black--7 ozs. logwood are boiled with three pints of water, filtered,
and the filtrate mixed with a solution containing 1 oz. of sulphate of
copper (blue copperas). The mixture is left to clear, and the clear
liquor decanted while still hot. The wood is placed in this liquor for
twenty-four hours; it is then exposed to the air for twenty-four hours,
and afterwards passed through a hot bath of nitrate of iron of 6i Tw. If
the black, after this treatment, should not be sufficiently developed,
the wood has to be passed again through the first logwood bath.
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