A pyrotechnic composition comprising microcrystalline nitrocellulose which is characterized as an ultra low-smoke composition. The pyrotechnic composition includes at least one flame coloring agent, and may be produced with or without an optional oxidizing agent, with or without an optional metal powder, with or without an optional chlorine donor. Upon combustion, the pyrotechnic composition produces illuminating emissions having desired colors and luminosity characteristics with significantly reduced or toxic combustion products and smoke.