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Spirulina is a blue green algae.   It contains loads of protein, vitamins, minerals and amino acids.   Here it is used in a cold processed soap recipe which produces a white soap bar.   1/2 teaspoon of Spirulina was used per pound of oils in this soap recipe.  The soap is a bit dark, but the lather is still creamy and white. 

A hint of blue may be seen when the soap is first cut into bars, but that hint of blue quickly disappears.  What you end up with is green soap.  And the green color of the spirulina seems to last a very long time. 

Spirulina cost a little more than other herbs or plant material that produce a green in soap.  But considering the color you can get from a very small amount, and the length of time the color lasts, it’s well worth the price.  As you can see, a little Spirulina goes a long way.