WHISTLING PROPELLANT #2
SOURCE: John Steinberg
COMMENTS: Whistle rockets must be made in the same way as a standard firework whistle, in the sense that it must be pressed very firmly for it to produce a whistling effect. The catalyst can be any metal oxide, though the usual ones used are titanium dioxide, copper oxychloride, and red iron oxide.
Whistle compositions should NEVER be rammed. They must be pressed, or an explosion may result.
PREPARATION (parts by weight):
|Potassium benzoate OR sodium benzoate||0.260|
NOTE: +2.5% is 0.025 x batch weight
(For example: 0.025 x 200 g = 5)