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My roman candles ussally use stars of about 1/2". Spider stars are my favorite for the candles. The delay mix i use is very effective and i use about 5g of it between each star and this gives about a 3-4 second delay.
The compostion is from the RSOC book 'The chemistry of fireworks'.
Roman Candle delay mix-
KN03- 52g
Soft grain blackpowder- 22g
Charcoal 40 mesh- 21g
Red Gum-5g
I then ball mill this together for about 4 hours.
