Black iron oxide is perfect for getting a deep shade of black in soap, or to deepen the tone of other colours. This is an all natural colourant.
To use in soap:
For cold process soap, add ½ teaspoon of oxide to 1-2 Tbps of a carrier oil like Sweet Almond and mix well – add 1 teaspoon of this mixture to your soap mixture.
|Yes, FDA approved for cosmetic use
|Matte black powder