When we collect the doe urine and put it in gallon jugs, the bottom of each jug settles out to be thicker and much darker. The doe urine while being collected does run down on to plastic, and it does run through the deer "pellets" which does stain the urine. We normally don't like to sell the tailings, just because it is so dark. We keep the tailings back and it is what me and my family use while hunting. It is the same great product, just a richer aroma, darker in color, and a little thicker.