I put a pinch of the powder into a sandwich bag, add the feeders and shake the bag gently to give them a light dusting. A tiny bit of orage/yello in the urates is not to bad, especially if the chameleon doesn't roduce one every day. The longer the urate stays in the body the darker it becomes as more water is absorbed. The end of the urate that leaves the body last is always the whitest as it has been in there for the shortest amount of time.