Mica powder
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What it is
A mineral pigment, usually coated, sold in small quantities to soap, candle and cosmetic makers. The colour is the product and the particle size is why it behaves the way it does.
Its regulatory position is unusually good
Mica is safe for coloring cosmetics generally, including the area of the eye, and is exempt from batch certification. That is a wide approval and it is worth stating accurately rather than vaguely.
But a commercial mica is a blend
Mica plus other colorants, and the blend is governed by its most restricted component. Publishing the full composition is what lets a customer answer the eye-area question for themselves.
The archetype
A powder format, 100 to 2,000 mL, wide mouth, dispensed by shaking. That is a jar you can get a spoon into and a fitment you can shake through.
The sifter is the product
13 spice caps on this shelf. Without one, dispensing a fine powder means tipping a wide jar, which clouds a workspace and wastes expensive material.
Static is the nuisance
Fine coated powders cling to everything, including the inside of a clear jar, which makes a half-full jar look emptier and messier than it is. There is no packaging fix, only an expectation to set.
Moisture is the real failure
A caked mica is unusable. A good seal and a dry storage instruction are the whole of the prevention, and the liner is what delivers the seal.
Sell it in sizes that match the use
A hobbyist uses grams per batch. The 100 mL end of the window is a real product and the 2,000 mL end is a wholesale one, and pricing them as the same product per gram ignores that they are different customers.