Chromium oxide green
Green.
Opens the calculator’s starter recipe, 1000 g of oils, with this additive at the dose it fills in, ready to change.
What it is
Chromium oxide green is a green pigment powder that holds its colour at soap’s high pH.
How much
- 1 tsp per pound of oils filled in Mad Micas supplier or guide
The calculator fills in 1 tsp per pound of oils: 10.8 g for the 1000 g of oils in its starter recipe.
When and how
- Usually: at light trace.
- Mix it first with a little of the recipe’s oil, about a teaspoon of powder to a tablespoon of oil, so it spreads without specks.
Wholesale Supplies Plus supplier or guide
What it does to the recipe
- It changes neither the lye nor the water: it is only weight in the bar.
Worth knowing
- Too much colours the lather. Lovin Soap supplier or guide
Spoons and drops
- 1 tsp ≈ 4.93 g (3.94–5.91 g)
- 1 tbsp ≈ 14.8 g (11.8–17.7 g)
- 1 cup ≈ 237 g (189–284 g)
LANXESS primary source
INCI name
CI 77288 (Colour Index number)
- CAS number
- 1308-38-9
- EC number
- 215-160-9
- US colour additive name
- Chromium Oxide Greens
Recipes that use it
Guides that discuss it
Sources
Wholesale Supplies Plus, soap colorants guide: titanium dioxide is "prized for its dense, white opacity", and "A single teaspoon is sufficient to lighten one pound of soap"; "half of this amount or even less for brown oxide and red oxide"; oxides "must be thoroughly mixed with oil before use"; micas offer "a spectrum of bright hues"; ultramarines have "potential to emit sulfurous odors".
Mad Micas: "1 tsp per pound of oils" for its red iron oxide, ultramarine blue and green chrome oxide; "Stable in high pH".
Lovin Soap, colouring soap: pigments "color lather if too much is used"; natural colourants "do tend to fade".
LANXESS, Colortherm Green GN technical data sheet (2025): tamped density 0.8–1.2 g/mL.