ar with some winestone, let it clarify, and spread the wood with
the filtered stuff. The addition of saffron makes a grass green."

A silver grey may be given to white wood by immersion in a decoction of
4 oz. of sumach in 1 quart of water, and afterwards in a very dilute
solution of sulphate of iron. A dilute solution of bichromate of potash
is frequently employed to darken oak, mahogany, and coloured woods. This
should be used carefully, since its effects are not altogether stopped
by thoroughly washing the wood with water when dark enough. To bleach
woods, immerse them in a strong, hot solution of oxalic acid.

Since ivory is often used in inlaying and is sometimes stained, a few
receipts for its staining will not be out of place. These come from
Holtzapffel's book:--A pale yellow will be given by immersing the ivory
for one minute in the tepid stain given by 60 grains of saffron boiled
for some hours in half-a-pint of water. Immersion for from five to
fifteen minutes produces a canary yellow brighter or deeper according to
the time given, but all somewhat fugitive. A stain from 4 oz. of fustic
dust and chips boiled in 1 quart of water produces similar but somewhat
darker and more permanent results. Ivory subjected to either of these
stains for fifteen minutes, and then placed for one to three minutes in
Brazil water stain acquires an orange colour. If then treated with
nitro-muriate of tin, an orange of a brighter, redder tone is produced;
transfer to a clean water bath directly the required colour appears, as
the nitro-muriate of tin acts very rapidly upon the ivory.

Fine scarlet cloth is used for dyeing various tones of red. A piece
about a foot square may be cut into shreds and boiled, with the addition
of 10 grains of pearl ash, in half-a-pint of water from 5 to 6 hours.
Immersion in the liquid for from three to ten minutes gives tones of
pink; for one hour and subsequently for half-an-hour in an alum mordant
gives a pink of a bright crimson character. When the ivory is from two
to three hours in the tepid stain a crimson red results, and the
addition of 1 part of sulphuric acid to 60 of stain gives billiard ball
colour. Pinks of a different and duller full tone may be obtained by
immersion for three minutes in Brazil water stain, followed by treatment
with nitro-muriate of tin; when the Brazil is used for six minutes a
deeper colour results. Fifteen minutes in Brazil, then treatment with
nitro-muriate of tin