Black Iron Oxide

Size: 1 oz jar
Sale price$4.20


Black iron oxide is the deepest black. It can be used in cold process to create black soaps, and it can be used in bath bombs to create true black.

INCI: Black Iron Oxide

Cosmetic use:
• Eyes
• Lips
• Bath Bombs
• External Use

Ideal for:
• Soap
• Resin
• Crafts
• Wax Melts

Prop 65: This product is not on the CA Prop 65 list of toxic chemicals.

• Use rate in cold & hot process soaps: .5-1 teaspoons per pound of oils.
• Use rate in melt & pour soaps: .25-.5 teaspoons per pound of oils.

~ More or less can be added to achieve your desired color. These usage rates are recommended for no colored lather. ~

Less is more when using black iron oxide! It's a very strong pigment. It will not migrate into other colors but will bleed if too much is used. Bleed will cause stained washcloths or cause the color to run down the side of the shower!

The greatest benefit of black iron oxide is that it will create a very deep black in soaps and will not migrate into other colors. It can be added to activated charcoal or black mica to create truly black soaps (no gray!)

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Customer Reviews

Based on 160 reviews
Very deep black

I love using black oxide in place of activated charcoal at times. This is a true black and you do not have to worry about your soaps turning gray.

The best

You cant go wrong with this black. Its my go to will will buy again and again!

True black

If you’re looking for a true black in CP soaps & bath bombs…then this is what you’ve been searching for! No grey tint, just a deep black. It’s definitely a staple in my colorant collection

Stacey t
Black iron oxide

I loved this. I have been trying to find something that makes my bathbombs and water a true black and not grey and this did the job and then some. I added some of the black onix eco glitter and was beautiful 😍.


The perfect black! Very pigmented!