The "yellow" beeswax candles are or used to be used during lent and for funerals. I've seen them used at funerals before at our chapel. I've made my own candles form my own wax before, and they are pretty yellow. I've read there is a way to sun bleach thin sheets of wax to whiten it. You can also use only virgin comb and /or the wax capping on honey comb to get a white wax.
cz