A wax candle burns with yellow flame.
These carbon particles rise in the the flame, get heated and glow to impart yellowish colour to the flame.
Hence, a wax candle burns with yellow flame.

Explanation

When a candle is lighted, the wax (hydrocarbons) melts and rises up the wick, which then gets conveted to vapours.
ii. However, due to insufficient supply of oxygen, the wax vapours undergo incomplete combustion resulting in the formation of unburnt carbon(soot).