RED 33 ●
TL;DR. This ingredient is a synthetic color additive used to tint formulas, especially clear or water-based products, at very low levels.
What does RED 33 do in a cosmetic formula?
This ingredient is a synthetic color additive used to tint formulas, especially clear or water-based products, at very low levels.
Is RED 33 clean?
From a clean-beauty perspective, it has friction because it is a synthetic colorant that may require regulatory batch certification and can appear on stricter restricted lists. It is not a common sensitizer, but use is governed by color-additive rules and product-area limits.
Is RED 33 sustainable?
This material is generally petroleum-derived and made through multi-step chemical synthesis. It is water-soluble, but synthetic colorants in this class are not typically viewed as strong fits for biodegradability or low-persistence goals.
Is RED 33 COSMOS-approved?
It is not aligned with COSMOS natural or organic standards, which generally do not permit this type of synthetic organic colorant. Its petrochemical origin and limited biodegradability profile make it a weak fit with Green Chemistry preferences.
How does RED 33 work chemically?
The molecule is an anionic sulfonated aromatic colorant with an azo linkage, supplied as a salt to improve water solubility and staining strength. It is typically used at trace levels for shade adjustment and performs best in aqueous systems where compatibility with pH, electrolytes, and cationic ingredients is checked during stability testing.
Last updated 2026-05-13