will be fit for use. When you paste this paper on any of your
works, take care that the paste does not touch that part which is to
burn.

The method of using this paper is, by cutting it into slips, long
enough to go once round the mouth of the serpent, cracker, &c. When
you paste on these slips, leave a little, above the mouth of the case,
not pasted; then prime the case with meal-powder (see p. 165) and
twist the paper to a point.

_Of such Ingredients as show themselves in Sparks, when rammed into
choked Cases._

The set colours of fire produced by sparks are divided into four
sorts, viz., the black, white, grey, and red; the black charges are
composed of two ingredients, which are meal-powder and charcoal; the
white of three, viz., saltpetre, sulphur, and charcoal; the grey of
four, viz., meal-powder, saltpetre, brimstone, and charcoal; and the
red of three, viz., meal-powder, charcoal, and saw-dust.

There are, besides these four regular or set charges, two others
which are distinguished by the names of compound and brilliant
charges; the compound charge being made of many ingredients, such as
meal-powder, saltpetre, brimstone, charcoal, saw-dust, sea-coal,
antimony, glass-dust, brass-dust, steel-filings, cast-iron, tanners'
dust, &c., or any thing that will yield sparks; all which must be
managed with discretion. The brilliant fires are composed of
meal-powder, saltpetre, brimstone, and steel-dust; or with
meal-powder, and steel-filings only.

_Of the Method of mixing Compositions._

The performance of the principal part of fire-works depends much on
the compositions being well mixed; therefore, great care ought to be
taken in this part of the work, particularly in the composition for
sky-rockets. When you have four or five pounds of ingredients to mix,
which is a sufficient quantity at a time, (for a larger proportion
will not do so well,) first put the different ingredients together,
then work them about with your hands, till you think they are pretty
well incorporated: after which, put them into a lawn sieve with a
receiver and top to it; and if, after it is sifted, any should remain
that will not pass through the sieve, grind it again till fine enough;
and if it be twice sifted it will not be amiss; but the compositions
for wheels and common works are not so material, nor need be so fine.
But in all fixed works, from which the fire is to play regular, the
ingredients must be very fine, and great c