This is something I’ll have to try in different ways. I made a 10 lb batch of soap and mixed two tsp to my oils then added my goat milk lye solution then after emulsifying and pouring half into my mold, I added another two tsp (mixed in a little oil) to the second half. One half of the swirl is darker, but a different tint or shade as well. One part is a dark grayish color and the other is more of a sea green. Very pretty, just not what I expected and the color is changing as it cures. I was hoping for that pretty light blue that I see with other soaps using this and I’ll have to keep experimenting.