marytsiang
Forum Replies Created
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I think I have NOT posed the question correct.I have been working a formula of foundation, W/Si, and one of my suppliers told me to stabilize the emulsion by adding 1% NACL in the aqua phase. This is why I talked for emulsions. I have also seen some formulas in creams/lotions which contain 1% of NACL. I was thinking that it must be an equilibrium between ions, for stabilizing reasons..
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@Doreen81 indeed i use them together sometimes. BHT and a mixture of tocopherols(among them A&D). Is there anything wrong?
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dear @cindyhr,
When clients’ demand made me eliminate the use of propyl paraben in my lipsticks (oil soluble, excellent choice by the way),i had to pass a ANTIMICROBIAL PRESERVATIVE EFFECTIVENESS TEST with other preservatives. I had tests with phenoxyethanol, which has some minimum solubility in oils.
it seemed that it passed the challenge test of 28 days.
On the other hand on what you see as bleeding, I noticed this in lipsticks that were refrigerated to get the mold cold, for a long time. this phenomenon is like a crystalization in a molecular stage,so, some of the raw materials of the lipstick formula, go out and bleed as a white powder. I had tests for molds, and went out negatives.In my case not a chance of oxidation, as I use Vit E, and B.H.T. in the formula.
I dont know if i helped, this is what i saw in my case, which in an initial stage, terrified me a lot. -
@Bobzchemist Thank you so much for the advice. Really felpful. Do you think that I could use this method both in color adjusting in the Lab, and in the production line? I’m thinking to make monochromatic bathces and follow the same way. Is it possible?
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@Bobzchemist thank you for your answer. Just to get it clear: when I mix the monochromatic batches, find the correct shade and note the amount of each one in the foundation,then I just have a reduction of the amounds of colorants to the final 10% CI of the formula?