I've shot this paint on and off again for well over a year, and it usually fails me. The last box I had, the balls were green with a yellow fill. The yellow fill was hard to see, but that was if you could get the fill out of the shell. I may of well have been hitting my friends with rocks, it's close to the same difference. I tried biting them, stepping on them, they wouldn't break. I've not only tried this on one or two boxes, but 5! Core has done nothing but disappointed me, I'm sorry I had to subject my friends to their ruthless beating.
Stay clear! If you have another option, buy something else.