These two infusions have been discussed many times. In addition to @Todd Ziegler 's excellent advice above, you may also want to find the magnifying glass icon at the top right of this page and Search for "indigo" and "spirulina" for more information.please tell me how to infuse spirulina and indigo powder in the oil and how much and how long should I keep it for infuse.
Thank you so very much for sharing this info, @Mobjack Bay . I've been paralyzed with researching and wondering (especially about "infusing" and what seem to be so many different methods) what to do with my new found indigo - that wouldn't end up with me tearing up because I didn't know enough to not waste it. Soaping should NOT be stressful!!! LOLI always think the word “infusion” is a bit confusing and also don’t find that I need to mix up big indigo and spirulina infusions to get the colors I want.
ETA: I just checked my notes for the soap that’s pictured in my avatar photo. For that one, I used almost a teaspoon of powder mixed in a little batch oil plus about an 1/8th of a teaspoon of activated charcoal to get that deep shade of blue in a batch that was 550 g of oils. That’s more indigo powder ppo than I indicated above. For that soap powder I added the indigo slurry to the oils before adding the lye water because I knew I wanted a deep shade of blue.
I hope you give it a try. If you don’t want to do a lot of experimenting, try mixing 1/4 tsp powder with 3/4 tsp oil for a batch size of 300-500 g of oil. That should get you in the range if you’re using a natural indigo powder. If it’s the synthetic kind, it takes less based on my experience. There’s less risk of color fail if the soap is gelled and your base is close to white.Thank you so very much for sharing this info, @Mobjack Bay . I've been paralyzed with researching and wondering (especially about "infusing" and what seem to be so many different methods) what to do with my new found indigo - that wouldn't end up with me tearing up because I didn't know enough to not waste it. Soaping should NOT be stressful!!! LOL
Beautiful! And what a relief to know about Indigo holding up! How concentrated was your indigo infusion used here? I’m looking for something that’ll be sky blue but hold up hopefully too@kaygrrl The indigo that faded in the sky of the soap above was very pale to begin with. Here’s an end cut from the soap in my avatar photo. It has faded some, but not much. I intentionally forced “rivers” in this soap, which is what you can see happening above the bottom layer, so the bottom layer is the one to focus on. The soap was made in fall 2019. I move my natural color soaps into the dark as soon as I can, but indigo holds up relatively well in use, compared with Matcha tea colored soap which fades really fast.
View attachment 54726
The details for that soap are at the bottom of post #6. I used a slurry of indigo powder and oil as described. I recommend that you test indigo and methods before making a big batch of soap. The color intensity of indigo powder varies depending on the plant species (there are several), age of the plants harvested, and probably also depends on how the powder was processed. I bought my indigo powder here.Beautiful! And what a relief to know about Indigo holding up! How concentrated was your indigo infusion used here? I’m looking for something that’ll be sky blue but hold up hopefully too
Sorry I don't know anything about the science.I've been wondering about indigo recently also - I've only ever worked with it for dying wool previously, and it's a whole rigmarole involving ammonia. Would any of the chemistry experts care to weigh in as to why it works in soap without all of that process? Does the lye somehow take the place of the ammonia so that all that is needed is to get the indigo powder into some kind of suspension for it to work in soap?