Alkanet is one of my favorite natural colorants to use. You end up with a wide variety of shades ranging from smoky purple to maroon depending on your soap’s PH, base oils and whether your soap gels or not. The most effective way to use it as a natural colorant is to infuse your liquid oil; I infuse my olive oil. I add 1 tablespoon of powdered alkanet and 5 ounces of olive oil into a jar and let it infuse for a week or two shaking it once a day.