how much colorant?

[cathym]

I just got some ultramarine purple oil soluble color powder and wondering how much to use in my swirling 4 lb batch

 

[IrishLass]

I make 2.5 lb batches and use UM violet/purple to swirl with quite often. I use it at a rate of 1/4 teaspoon total to swirl a 2.5 lb. batch. What I do is I stickblend the colorant into about 1/4 cup or so of emulsified soap batter, set it aside, and then I swirl it into my main batch when it's time. If I were to do a 4 lb. batch, I would probably use about 1/2 teaspoon of the colorant, or maybe just a tad bit less, and mix it with about 1/2 cup or so of emulsified soap batter to swirl with.

IrishLass