I add one drop black (X2) to 4 drops June Bug (x2) in 4oz of plastic. It would probably be better with 1/2 drop of black...I just can't figure out how to 1/2 drop!! (actually...I put one drop on a spoon, removed a little with a paper towel, and then stirred it in ...but I'm not that picky on colors so I just did the rest with one drop!).
Andy