I am new to taxidermy and I purchased some Jonas Magnesium Carbonate a month ago. The box says to mix 3% peroxide with the powder to create a paste. The powder in my box is Grey. I researched Magnesium Carbonate on Wikipedia and the powder is supposed to be white. I tried to call Van Dykes where the powder was purchased but it is after hours. My question are as follows: If I put this grey powder(paste) on my deer skull I am planning to European is my skull gonna turn grey vs. the white color that should actually be? Did I get a bad batch or such? And any other tips would be greatly appreciated.