Hi, I have been making goats milk soap and every time it looks beautiful after it is made and when I go down stairs in the morning it has changed color drastically. I add the lye to the milk by the tablespoons and do not let the milk get over 70 degrees. Last batch I used green french clay and layered it with uncolored batter. It was a beautiful. Cream color with green stripes. In the morning it was pink with charcoal grey stripes. I used essential rosewood oil and musk. If anyone can help me out trying to control the outcome I would be very grateful.