The compounds should be ignited in a small pill box resting on a plate. All the ingredients must be dried and powdered separately, and then lightly mixed on a sheet of paper. Always bear in mind that sulphur and chlorate of potassium explode violently if rubbed together.

Smokeless Vari-Colored Fire

First take barytes or strontium, and bring to a glowing heat in a suitable dish, remove from the fire, and add the shellac. The latter (unpowdered) will melt at once, and can then be intimately mixed with the barytes or strontium by means of a spatula. After cooling, pulverize. One may also add about 2.5 per cent of powdered magnesium to increase the effect. Take for instance 4 parts of barytes or strontium and 1 part of shellac.

The following salts, if finely powdered and burned in an iron ladle with a little spirits, will communicate to the flame their peculiar colors.

Potassium nitrate or sodium chlorate, yellow.

Potassium chlorate, violet.

Calcium chloride, orange.

Strontium nitrate, red.

Barium nitrate, apple green.

Copper nitrate, emerald green.

Borax, green.

Lithium chloride, purple.

The colored fires are used largely in the production of various theatrical effects.

Blue Fire

I

Ter-sulphuret of

antimony....... 1 part

Sulphur.......... 2 parts

Nitrate of potassium 6 parts

II

Sulphur..........     15 parts

Potassium sulphate     15 parts Ammonio-cu p r i c

sulphate.......     15 parts

Potassium nitrate..     27 parts

Potassium chlorate    28 parts

III

Chlorate of potash.       8 parts

Calomel..........       4 parts

Copper sulphate. . .       5 parts

Shellac...........       3 parts

IV

Ore pigment......       2 parts

Charcoal.........       3 parts

Potassium chloride      5 parts

Sulphur..........     13 parts

Potassium nitrate..     77 parts

V

Potassium chlorate     10 parts

Copper chlorate. . .     20 parts

Alcohol..........     20 parts

Water............   100 parts

VI

Copper chlorate. . . 100 parts Copper nitrate.... 50 parts Barium chlorate... 25 parts Potassium chlorate 100 parts

Alcohol.......... 500 parts

Water...........1,000 parts

Green

I

Barium chlorate... 20 parts

Alcohol.......... 20 parts

Water............ 100 parts

II

Barium nitrate. ... 10 parts Potassium chlorate 10 parts

Alcohol.......... 20 parts

Water............ 100 parts

III

Shellac........... 5 parts

Barium nitrate. ... 1.25 parts Pound after cooling, and add

Barium chlorate, 2 to 5 per cent.

Red

I

Shellac..........           5 parts

Strontium nitrate 1 to 1.2 parts

Preparation as in green fire. In damp weather add 2 to 4 per cent of potassium chlorate to the red flame; the latter causes a little more smoke.

II

Strontium nitrate..     20 parts

Potassium chlorate     10 parts

Alcohol..........     20 parts

Water............   100 parts

Yellow

I

Sulphur..........     16 parts

Dried carbonate of

soda...........     23 parts

Chlorate of potassium ...........     61 parts

II

Sodium chlorate. ..     20 parts

Potassium oxalate.      10 parts

Alcohol..........     20 parts

Water............   100 parts

Violet

I

Strontium chlorate.     15 parts

Copper chlorate. ..     15 parts

Potassium chlorate     15 parts

Alcohol..........     50 parts

Water............   100 parts

II

Potassium chlorate 20 parts Strontium chlorate. 20 parts Copper chlorate. .. 10 parts

Alcohol.......... 50 parts

Water............ 100 parts

Lilac

Potassium chlorate    20 parts

Copper chlorate. ..     10 parts

Strontium chloride.     10 parts

Alcohol..........     50 parts

Water............   100 parts

Mauve

Chlorate of potash .     28 parts

Calomel..........     12 parts

Shellac...........       4 parts

Strontium nitrate. .       4 parts

Cupric sulphate ...       2 parts

Fat..............       1 part

Purple

Copper sulphide.. .      8 parts

Calomel..........       7 parts

Sulphur..........       2 parts

Chlorate of potash.     16 parts

White

I

Gunpowder.......     15 parts

Sulphur..........     22 parts

Nitrate of potassium    64 parts

II

Potassium nitrate. . .   30 parts

Sulphur...........   10 parts

Antimony sulphide

(black)..........     5 parts

Flour.............     3 parts

Powdered camphor.     2 parts

III

Charcoal.......... 1 part

Sulphur........... 11 parts

Potassium sulphide. 38 parts

IV

Stearine...........     1 part

Barium carbonate ..     1 part

Milk sugar.........     4 parts

Potassium nitrate ....     4 parts

Potassium chlorate.   12 parts

As a general rule, a corresponding quantity of shellac may be taken instead of the sulphur for inside fireworks.

The directions for using these solutions are simply to imbibe bibulous papers in them, then carefully dry and roll tightly into rolls of suitable length, according to the length of time they are to burn.

Fuses

For fuses or igniting papers, the following is used:

Potassium nitrate... 2 parts

Lead acetate....... 40 parts

Water.............100 parts

Mix and dissolve, and in the solution place unsized paper; raise to nearly a boil and keep at this temperature for 20 minutes. If the paper is to be "slow," it may now be taken out, dried, cut into strips, and rolled. If to be "faster," the heat is to be continued longer, according to the quickness desired. Care must be taken to avoid boiling, which might disintegrate the paper.

In preparing these papers, every precaution against fire should be taken, and their preparation in the shop or house should not be thought of. In making the solutions, etc., where heat is necessary, the water bath should invariably be used.