I raise grass fed hair sheep and decided to make 100% sheep tallow soap. After the lye is mixed in to the tallow, the mixture turns a nice bright pink color. The soap turns out very good, and after it hardens the pink color is much more subdued - more of a light creamy pink color. I have made this soap twice and it did the same think both times. When I use less then 100% tallow, adding other oils it doesn't turn pink. Any ideas why? I am guessing there is some mineral in the sheep tallow that chemically causes the pink color.