If you want the soap to all be one unified color, add the colorant to the pot and stir. If you want to achieve more of a swirl effect:
- Ladle about 1/2 to 1 cup of the soap mixture into a measuring cup.
- Add the colorant to that bit of soap.
- Holding the measuring cup several inches above the pot, slowly pour the colored soap into one corner of your soap pot.
- Then, using a rubber spatula, swirl the colored soap through the pot. Don't stir too much or you'll end up just blending the color in with the entire batch.
Here's a really great demonstration of swirling in the pot.
