Blue star with charcoal tail

Composition

Description

Add isopropyl alcohol for binding. Cut, round and pumped stars can be made with this composition, but a typical KClO4/Red gum/Charcoal/dextrin prime will be necessary. A final layer of sodium nitrate/sulfur/Charcoal (85/5/10), moistened with NC/acetone lacker (w. about 3% NC) can be added. This adds yellowish sparks. Mealpowder can be used instead if the yellow sparks are not desired.

Source: 
rec.pyrotechnics, posted by sweden <sweden@synchron.ct.se. Source of this composition is Bruce Snowden