Or is the question just "CAN I add colour to my soap using hibiscus?"?
That, I do not know
Some things can not be infused in oil. For those you need to infuse them in water. Try boiling your hibiscus in water, you will get the color, however I can't say the color in finished soap as I've never used it.
Other than calendula/marigold petals, almost all botanicals will turn brown in soap, even in MP.
Can we consider paprika beeing a botanical? If so, we have another example of botanical which is not turning brown in soap.
What about parsley? I get a beautiful green from the dried kind that I get at the Mexican supermarket (it is the brightest green that I have ever seen)
I have tried hibiscus and it does not work. I ground it up into a powder and had a bunch of black specs in my soap
Try if your water is 350 grams then use 250grams water and 100grams of hibiscus tea and add the tea after light trace, I am not if the colour will still turn brown but I think it worth of try.
Adding at trace will only help keep some of the heat away - but obviously any heat from the saponification will still affect it. You are adding the tea to the lye anyway - a bit more spread out, but both will be distributed through out the batter so lye and tea will be reacting no matter what you do.
So to cut short for myself only natural colorants foor CP are:
coco milk = white
papricak = Orange
Carrot = yellow !
(indigo is not that much available in my country)
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