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Used a crayola crayon. (not being a sarcastic ***) got the idea from seeing guys at the range coloring in there pistols and ar15's with crayola crayons.
step 1.
Pick your color crayon you want.
step 2.
Just heat up a bit with a lighter (doesnt take long) I just did a bit at a time.
step 3.
begin to color it in....
step 4. (maybe not needed)
I placed in freezer let it get cold for about a hour.
step 5.
get a microfiber towel and rub off the access wax. (microfiber towel works best in my experiance.)
You can also try rubbing the crayon on it a little and wiping off with the microfiber towel that seemed to work also.