Ultramarine (blue, violet or pink)
Blue, violet or pink.
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
Ultramarine is a pigment powder. In contact with acid it gives off hydrogen sulfide, which is why suppliers warn of sulfurous smells.
PubChem primary source, Wholesale Supplies Plus supplier or guide, Mad Micas; TKB Trading supplier or guide
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: 9.2 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
- Caution: Acid makes it give off hydrogen sulfide, which smells of rotten eggs: keep it away from acidic additives. PubChem primary source, Wholesale Supplies Plus supplier or guide
- Stirred in dry, it leaves specks: mix it with a little oil or water first. Wholesale Supplies Plus supplier or guide
Spoons and drops
- 1 tsp ≈ 4.19 g (3.45–4.93 g)
- 1 tbsp ≈ 12.6 g (10.4–14.8 g)
- 1 cup ≈ 201 g (166–237 g)
Mad Micas; TKB Trading supplier or guide
INCI name
CI 77007 (Colour Index number)
- CAS number
- 12769-96-9, 1302-83-6, 57455-37-5
- EC number
- 235-811-0, 215-111-1
- US colour additive name
- Ultramarines
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".
PubChem, ultramarine blue: "evolution of hydrogen sulfide after contact with acid".
Mad Micas (2024) and TKB Trading (2025), ultramarine blue safety data sheets: bulk density 0.7–1.0 g/mL.