Inspired by @Mobjack Bay's wonderful result with a madder tincture I decided to try something similar with different plant-based colorants. I was especially interested as to what would happen if I'd add it after HP cook, as plant colorants are notoriously difficult to use in HP and I hoped this would help (winking at @Dawni) I took 1g each of annatto, paprika, alkanet, indigo, spirulina, moringa and matcha and added 15g of isopropanol. Let it sit for 4-5 weeks and tried to remember to shake twice daily (although I forgot quite often). The colors got gradually darker and the containers got gradually lighter as I wasn't able to prevent the alcohol from evaporating (next time I think I'll use a jar with a srcew-on top lid or maybe a weck jar for canned goods). I think infusing for 2 weeks would have been more than enough, but I was too busy doing other stuff and procrastinated a couple of weeks.. I made a 100% CO soap with 20% superfat. Initial lye concentration was 1:2. After cook I added some yoghurt and the colored alcohol at 1 part (total lye concentration would be 1:3, last part is colored alcohol added after cook. Am I making sense?) Measuring out the soap and deviding it evenly over the 7 containers took a bit more time than I had hoped which got me some rustic white spots of already solidified soap, but I think that could be avoided in a normal process. Annatto, paprika and matcha powders seemed to be a bit coarser and stayed on the bottom when pouring off the top. Alkanet, indigo, spirulina and moringa were finer ground powders and some of the powder got into the soap. Here are pictures of the colored alcohol and of the soaps after mixing in the colorants. From top to bottom: ---------------Matcha-Indigo--------------- Paprika-Moringa-Alkanet-Annatto --------------------Spirulina-------------------- Observations: Matcha is not very interesting. Indigo is a bit grey-ish, paprika is a peachy color, Moringa a moss-like color, alkanet a very dark purple, Annatto a bright orange and spirulina really surprised me with such a vibrant green color! It does seem like the alcohol makes the colors look brighter (though annatto is aways quite bright) maybe because the alcohol dissolves the soap a bit.. The soaps are also really soft despite being 100% CO, so this way of coloring soap is probably not suitable for recipes with a lot of soft oils. It's easier to add 1 part liquid after cook than to add 15% oils after cook (which in this case was about the same amount: 5g/35g oils) So to summarize, I think there's a potential here, but not for all colorants and also not for all recipes.