Nylon-12 Fluorescent Brightener 230 Salt

This is a specialty optical brightener associated with nylon powder systems used for visual effects; such fluorescent brighteners are typically used at very low concentrations but are not widely supported by robust facial leave-on safety/patch-test data in highly sensitive populations. While nylon-12 itself is generally low-irritant, the added brightener salt increases uncertainty for irritancy and potential sensitization, so I score it as mild risk to prioritize safety for reactive and eczema-prone skin. Safety Notes: In consumer cosmetics, fluorescent brighteners used for optical brightening/blue-violet correction are typically dosed at very low levels, commonly around 0.001–0.05%, especially in leave-on tone-up/brightening primers, foundations, and some body lotions where minimal staining and photostability are needed. Higher-strength OTC products marketed for “instant brightening” or stronger optical correction (often makeup-adjacent leave-on formats and some rinse-off cleansers) have been observed up to about 0.1–0.5%, with the upper end constrained by color shift, fluorescence intensity, potential fabric staining, and general formulation aesthetics rather than a specific global cosmetics maximum limit.

Suitability