What byproduct tends to accumulate around microgravity flames due to inefficient burning?

Answer

Soot accumulation

The oxygen supply restriction caused by diffusion leads to inefficient burning, resulting in the production of soot, or uncombusted carbon particles, which can accumulate around the flame or stick to surfaces.

What byproduct tends to accumulate around microgravity flames due to inefficient burning?
physicsSpacecombustionoxygenfire