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Red Iron Oxide Film
What cause Red Iron Oxide to “bleed out” of some formulas… Usually Kamaflage and Liquid Foundations involving other Iron Oxides…. It seems to form a film on top or sides if a product is laying on its’ side… As if floating on top….
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4 Replies
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What are you making? I’ve never had that problem yet but color mixing and science isn’t as easy as it looks.
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It has to do with the organic pigment used. It is said to be common with lakes (an insoluble colourant produced by precipitating a soluble dye onto an insoluble substrate), and not seen with other pigments: lakes are affected by an inadequate pH when added in the formulation, which results in the soluble dye re-forming, a condition known as “bleeding”- Chapter 6, Discovering Cosmetic Science (2021), Royal Society of Chemistry
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I am referring to Inorganic Red Iron Oxide… It isn’t separating… It is more like a russet colored film that floats on the top of a Batch or if you lay the formula on its’ side, in packaging those russet “rings” will float to the top where it meets the air….
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I wish I could help, but aside from testing the pigment from a different supplier, no brilliant ideas…
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