Writing to this forum 2nd time since the 1st one was very helpful.
I am trying to make a cosmetic product ( face/body mask) which main ingredient is natural sea mud ( 94% minerals, 5% organics, 1% carbonates).
My formulating goal is to get control over the natural mud odor, viscosity, stability, and microbial activity.
There has been A LOT of failed formulations and some better ones. So far most successful for my preference is the following :
Mud - 92,5%
Glycerin - 7%
Xantham gum - 0.1%
Jojoba oil - 0.4%
Calluna Vulgaris aroma oil - 1 drop
Glycerin and xantham being mixed separately and then added to mud.
For the microbes I will add 0,5 - 1% phenoxyethanol/dehydroacetic acid or I will go to gamma irradiation with cobalt 60, but before doing so I will have to lower the PH of the formula from ~7 to 5.5 and make it stable in terms of freezing.
I am thinking of adding citric acid for PH and butylene glycol in terms of not freezing.
Has anyone had experience mixing citric acid or butylene glycol with organics?
Do you think there might be any chance of success?
The reason why I cannot try it for myself yet is that I have to wait for the ingredients to arrive for 5 more days.
Most grateful for the feedback!