David Bleser’s #13 Flitter. I have never tried it in comets but it’s worth a try. It makes a beautiful golden tail in stars. Potassium nitrate 36 Sulfur 8 Aluminium dark 30 Aluminium bright 19 Boric acid 1 Dextrin 6 Of course all measures are in weight. This composition may be a little hard to ignite, so prime with 50/50 comp./meal and then a final layer of meal.