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Rubia Cordifolia
MADDER ROOT POWDER (manjistha) is a natural botanical that will colour your cold process soap a lovely pink colour - ranging from dusky pale pink to a dark pink. But be careful how much you use as you can colour the soap lather pink. - and it is not easy to remove from face cloths or towels.
You can infuse the madder root powder in oil or stick blend it straight into your soap for a speckled effect, or pop it straight into your lye solution. Remember to gel your soap to obtain the best colour.
I always have a windowsill infusion on the go. As soon as I use one lot I add a more madder root powder and fill up the jar with olive oil and start again.
As a guide - use 1 tablespoon per 500gms of oils - this will give you a bright pink - so less for a dusky pink.
And remember - the colour of your base oils and scent blend will influence the shade you achieve. Have fun experimenting!