throw it out and buy caps from a better source. if you have a milligram scale you could weigh out the powder and "parachute" it http://en.wikipedia.org/wiki/Parachute_%28drugs%29 . I wouldn't mix it with liquid or put it in my mouth directly- not because of staining, but because legit DNP tastes somewhat like a mix of gunpowder and paint. Once that powder hits the back of your throat and makes its way down your esophagus, you'll know what its like to swallow a shot of paint.