Zinc oxide
White. Bramble Berry supplier or guide
Opens the calculator’s starter recipe with this additive in it. No source gives a dose to fill in, so enter your own.
What it is
Zinc oxide is a mineral colourant in the EU’s Annex IV, sold in USP grades as a powder of 0.48–0.64 g per mL.
Regulation (EC) No 1223/2009 primary source, Horsehead primary source
How much
No source gives a dose for soap: enter your own.
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.
Bramble Berry 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: Do not breathe the powder: wear a dust mask when you weigh it. EU law bars it from products whose use can reach the lungs. Regulation (EC) No 1223/2009 primary source
Spoons and drops
- 1 tsp ≈ 2.76 g (2.37–3.15 g)
- 1 tbsp ≈ 8.28 g (7.1–9.46 g)
- 1 cup ≈ 132 g (114–151 g)
Horsehead primary source
INCI name
CI 77947 (Colour Index number)
- CAS number
- 1314-13-2
- EC number
- 215-222-5
- US colour additive name
- Zinc Oxide
Guides that discuss it
Sources
Bramble Berry, zinc oxide: "This non-nano white colorant is perfect for handmade soap"; "mix 1 teaspoon with 1 tablespoon of lightweight oil".
Regulation (EC) No 1223/2009, Annex IV entries 143 and 144 and Annex III entry 321: titanium dioxide and zinc oxide "Not to be used in applications that may lead to exposure of the end-user’s lungs".
Horsehead Corporation, USP grade zinc oxide series (2009): apparent density 30, 40 and 35 lb/ft³ (0.48–0.64 g/mL).