I use the microwave/pyrex method but see a similar thing happen when pouring with some of M-F's colors. Their smoke pearl line is one of them. I have to pour out the whole cup. If I reheat, I get a brownish tint. This is the plastic scorching, I imagine. Some of their colors are VERY weak compared to others and it take sometimes 4 times the amount of color in comparison to other brands. Certain colors also require LESS time to heat to a pourable state. If I heat their white, smoke pearls and pumkinseed the same amount of time as their other colors, the plastic will scorch. I have to use the same time as if I'm pouring a clear bait. You might try mixing a smaller amount of the brown/grape in a pyrex to do the tails.