-
Discoloration during stability green clay and matcha powder facial mask
Hi,
I’m developing a facial mask formula containing green clay and matcha powder. The product turns brown after about 20 days, both at 40°C and RT stability.
It contains 3% cupuacu butter, 6% olivem 1000, and 1% stearic acid as the oil phase. Water + hydrosol + tetrasodium glutamate diacetate 0.15% as water phase. Preserved with geogard ECT. It contains 0.3% actual tocopherol and some extracts (green tea + concentrated mix of different extracts). pH 5.3-5.8.
For the green clay and matcha, I have tried:
- Initial formula: 4% matcha powder and 2% green clay
- Current formula: Reduced matcha to 0.5% and kept green clay at 2%
The brown color change still occurs with the reduced matcha 0.5% input.
I am thinking of reducing the matcha to 0.1% while keeping the green clay at 2%. Or even take matcha out.
Has anyone worked with matcha powder in formulations and experienced similar issues?
Any recommendation would be highly appreciated.
-
1 Reply
-
Hi,
1. Clay masks are notoriously difficult to preserve, and I highly doubt that geogard+TGDA will do the job. On top of that, you have hydrosol in there plus some other plant extracts, and all of these contain yummy bug-food. If cupuacu it’s unrefined, it also contains some bug-food.
2. Regarding the change of colour, it occurs usually with any plant-powder, it’s not a matcha-related issue. Most of the powder-solutions (water) will have a beautiful colour at a very acidic and/or alkaline pH, but will become “ugly” at a skin-friendly pH- for example, hibiscus turns gray. Also light and heat can further affect the colour.
3. Cupuacu is a fairly stable butter, so no need to add tocopherol, and increase your cost.
Log in to reply.