American Aeroplane Smoke-Signal Grenades

Red

Potassium chlorate.....................

20

Lactose...........................

20

Paranitraniline red ............................

60

Yellow

Potassium chlorate........................

33

Lactose...........................

24

Auramine ............................

34

chrysoidin.............................

9

Green

Potassium chlorate............................

33

Lactose ....................................

26

Auramlne.......................

15

Indigo (synthetic)........................................

26

Blue

Potassium chlorate........................

35

Lactose............................

25

Indigo (synthetic) ................................

40

Smoke-Torch Formula

Parts.

Potassium nitrate.............................

23

Sulphur

2

Hard tar

15

Powdered borax............................

5

Sand

5

This was later changed to increase burning time to:

Parts.

Potassium nitrate .............................

22 1/4

Pitch...........................

15

Borax ............................

5 1/2

Sulphur..............................

2

Sand...........................................

2 3/4

Whiting (calcium carbonate).........................................

2 1/2

With an alternate formula of:

Parts.

Saltpeter.....................

16

Pitch.......................

11 to

12

Borax........................

3 to

4

Sulphur..................................

3 to

5

Ground glue or sand........................

1 to

1 1/2

These compositions were satisfactory.

A small smoke torch was advocated, but never made.