Spirulina powder makes a nice green-blue in soap and cosmetic recipes. It can be infused or added straight, though it will be somewhat exfoliating. Recommended usage range is between 1/4 teaspoon and 1 teaspoon per cup of soap. This product, like many things used as natural soap colorants, will fade over time. Please note that this is a natural ocean product, so it does hold a ocean-y scent which can remain in your finished product, but will fade over time. It is available in 2 and 4 oz amounts. It is packaged in a 5 mil plastic stand up pouch with a resealable zip top. It is not able to be shipped internationally.