Actually, it is quite unnecessary to bleach beeswax before coloring it.
The important thing is to use liquid or powder wax dyes, not pieces of
colored wax.  I never could get my candles colored properly until I
discovered the powder dyes, which will give intense colors even with
quite dark wax.  They are available from most beekeeping supply outlets
- here in Michigan from Groeb Farms, Onsted, Michigan, for example.
 
Ted Fischer
Dexter, Michigan USA