sponge,
and give two coats; when dry, glass-paper down with fine old paper. This
makes a good imitation for inside work. By the addition of a little
dragon's blood an orange tint can be produced. A yellow colour can also
be given to wood by boiling hot solutions of turmeric, Persian berries,
fustic, etc. but the colour is very fugitive. A more permanent colour
results from nitric acid, and last of all by the successive introduction
of acetate of lead and chromate of potash. Sulphate of iron also stains
wood of a yellowish colour when used as a preservative agent, so much
so, that the use of corrosive sublimate is recommended for this purpose
when it is desirable to preserve the light colour.

=A Blue Stain.=--This dye can be obtained by dissolving East Indian
indigo in arsenious acid, which will give a dark blue. A lighter blue
can be obtained by hot solutions of indigo, of sulphate of copper, and
by the successive introduction of pyrolignite of iron and prussiate of
potash.

=A Green Stain.=--Dissolve one ounce of Roman vitriol in a quart of
boiling water, to which is added one ounce of pearlash; the mixture
should then be forcibly agitated, and a small quantity of pulverised
yellow arsenic stirred in. A green is also the result of successive
formations in the pores of the wood of a blue and a yellow as above
indicated, and by a hot solution of acetate of copper in water. A
yellowish green may be obtained by the action of copper salts on the red
prussiate of potash.

=A Purple Stain.=--Boil one pound of logwood chips in three quarts of
water, until the full strength is obtained; then add four ounces of
pearlash and two ounces of powdered indigo. When these ingredients are
thoroughly dissolved, it is ready for use, either hot or cold. A purple
is also obtained by a boiling hot solution of logwood and Brazil-wood,
one pound of the former and one quarter of a pound of the latter to a
gallon of water.

=A Red Stain.=--Methylated spirits one quart, Brazil-wood three ounces,
dragon's blood half an ounce, cochineal half an ounce, saffron one
ounce. Steep the whole to its full strength, and strain. A red can also
be produced by macerating red-sanders in rectified spirits of naphtha.
An orange-red colour may be obtained by the successive action of
bichloride of mercury and iodide of potash, madder, and ammoniacal
solutions of carmine.

=Imitation Purple-wood Stain.=--Grind a piece of green copperas on
coarse gl