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sos change of color
I would really appreciate it if you could give any advice about a production issue that I came across.
A simple recipe of a concealer stick, with carnauba wax, beeswax,ozokerite, paraffinum liquidum,castor oil, and pigments pre-despersed in castor oil.
we unfortunately 3 months after the production, have complains that the color looks beige, but it relly writes like pink.
I assume that we have oxidation, even if I used BHT and tocopherol..
Any advice would be appreciated.
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7 Replies
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@mayachem, did you do a real time stability test? That can usually take about 3 months to do properly?
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Somewhat weird. Using only iron oxides?
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If it looks different on the stick than on the hand, that doesn’t indicate oxidation to me. What about writing on paper or not-skin? Does the color also appear pink there?
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Did you mill it? Probably your red IO coming out.
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You can also buy pre dispersed pigments if you don’t have a mill.
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Have you cut a bullet up? This is very common when mixing iron oxides in castor oil and wax blends. Injection and cooling stage your red is sinking down in my opinion. I bet the bottom of the bullet will be less so..
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@Tal025 what do you mean by injection and cooling stage?It is a filling process issue?
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