Mineral Pigments in Makeup and Their Hotlist Impurity Caps

Mica, iron oxides, titanium dioxide, ultramarines. These mineral pigments carry makeup formulas everywhere from eyeshadow to mineral foundation, and they're broadly permitted ingredients. But mineral pigments are mined or processed from natural sources, and that origin is exactly why they need a slightly different kind of scrutiny than a synthesized ingredient with a single, predictable composition.

The pigment can be fine while its impurities aren't

This is the part that surprises makers who assume "the ingredient is on my supplier's approved list" is the end of the compliance question. Mineral pigments, because they come from geological sources, can carry trace levels of naturally co-occurring substances, certain heavy metals being the classic example, depending on the mine, the processing method, and the specific batch.

The Hotlist addresses this reality directly in some entries by setting an impurity ceiling tied to the pigment, a maximum allowable trace level for a specific contaminant, rather than restricting the pigment itself. So you can have a fully permitted mineral colorant that still needs to be checked, batch by batch, against an impurity threshold that has nothing to do with the pigment's primary function or its INCI name.

Why this is a supplier documentation issue, not a formula issue

You generally can't determine impurity levels by looking at the finished product or even the raw pigment's typical specification sheet. This is where your certificate of analysis becomes essential rather than optional paperwork. A COA for a mineral pigment batch should report the actual measured levels of relevant trace contaminants for that specific batch, not just confirm the pigment's primary identity and particle size.

If your supplier's documentation for a mica or iron oxide doesn't include impurity testing results, that's worth asking for directly before you use the batch in a product headed toward notification. Some suppliers test every batch; others test periodically and provide a representative range. Know which situation you're in, and keep the actual COA on file, not just a general product spec sheet.

A practical way to think about it

Pigment type	What's typically checked	Why it matters
Mica	Trace heavy metal impurities, depending on mine source	Natural mineral, composition varies by deposit
Iron oxides	Trace impurities from processing	Can be natural or synthetically produced; sourcing affects purity profile
Ultramarines	Trace impurities, plus specific handling notes in some jurisdictions	Chemical structure differs from oxide pigments
Titanium dioxide	Particle size and impurity profile, alongside any restrictions on use in certain product forms	Widely used, permitted, but batch consistency matters

Treat this table as a starting orientation, not a substitute for checking the current Hotlist entries and your specific supplier's COA, since exact impurity thresholds and which pigments carry them are set by Health Canada and can be updated.

Coated and treated pigments add another layer

Many mineral pigments used in modern makeup formulas aren't used raw. They're surface-treated or coated, with silica, with a fatty acid coating, with a dispersant, to improve how they behave in a formula. Each of those treatments is itself an ingredient that needs its own INCI identification. A "treated mica" isn't automatically covered by checking plain mica against the Hotlist. Ask your supplier for the full composition of the treated pigment, not just the base mineral name, and map every component individually.

Building this into your ingredient intake process

A workable habit for any brand using mineral pigments regularly:

1. Request a current, batch-specific COA for every mineral pigment shipment, not just the first time you order from a supplier
2. Confirm the COA reports impurity testing results, not just primary pigment identity
3. Identify whether the pigment is coated or treated, and get the full INCI breakdown of any coating
4. Check both the base pigment and, where relevant, any documented impurity threshold against the current Hotlist before finalizing your formula for filing
5. Keep the COA on file alongside your other supplier documentation for that product, since this is exactly the kind of detail a regulator could ask you to substantiate

Where this fits into your filing

None of this means mineral pigments are a compliance minefield to avoid. They're common, permitted, and well understood ingredients. The point is that "permitted" and "no further check needed" aren't the same thing for naturally sourced pigments, and skipping the impurity check is one of the quieter ways a color cosmetic ends up out of step with the Hotlist despite using an entirely legitimate ingredient.

Cosmetic Comply's screening process checks your full ingredient list, including pigments and their documented impurity profiles where supplier data supports it, against the current Hotlist with a confidence score, and a human reviewer looks over anything that needs a closer read before your notification is filed.