This is my spirulina soap just unmolded, at 2 weeks old and 6 months old. It was an early soap and the final photo is the best of all I have left.
I used an oil infusion with 2tbs of spirulina in 250 mls of OO heated over double boiler for 2 hrs at 150 degree F. I used it at 10% of my oil percentage in the recipe which I added to the oil before the lye.
I think cmzaha says it is better to mix the spirulina directly to the batter.
However, what I wanted to say that spirulina has not brought anything to the soaps. In soaps made with spirulina there is a huge reduction of lather, it is not as creamy or conditioning and it doesn't compared to my other soaps about the same time and ones I make now. I have perfected things a bit but the soaps with spirulina are really terrible in my experience.
The red soap still looks exactly the same:
I made them on the same day using the same recipe with 1 teaspoon of Australian Pink Clay mixed with 1 tsp of water and added it just before trace and only took it to light trace.
The tsp of water was extra water and I was using 30% lye concentration. It is a bit mushy after a few uses and I have to dry them out for a few days to reuse. (I now think even 1 tsp of water extra makes a soft soap). I CPOP at 100*F and turned off the oven when it went in.
I don't mind the feel of the clay soap. But it is not my favourite.