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COBALT CHLORIDE.

Avoid CAS 7646-79-9 / NOT REPORTED

A metal salt historically used as a pigment and humidity indicator, though its application in modern personal care is strictly limited due to toxicity concerns. While it can mimic hypoxia in laboratory settings, it is primarily recognized today as a significant allergen and regulated substance.

allergen irritant pigment research chemical

Science

It functions as a hypoxia mimetic by displacing iron ions (Fe2+) within prolyl hydroxylase enzymes, which stabilizes Hypoxia-Inducible Factor-1α (HIF-1α) and triggers cellular responses to low oxygen. On the surface, it acts as a potent sensitizer, inducing inflammatory responses and contact dermatitis through protein binding.


Research

Low confidence
Effective range N/A
Optimal

N/A


Transparency

Not commonly dusted

This ingredient is not used for active skin benefits in reputable skincare; any presence in a formulation would be considered a safety violation rather than 'dusting' for marketing.


The Formula

Solubility
Water
Optimal pH N/A
0 7 14

Stability

Highly soluble in water, creating a weakly acidic solution (pH ~4.6 at 0.2M). It undergoes a distinctive color change from pink to blue when dehydrated, though it remains chemically incompatible with strong oxidants and mineral acids.

Conflicts

  • oxidants
  • potassium
  • sodium dispersions
  • t-butyl hydroperoxide
  • strong mineral acids
  • metal halides

Safety

CIR Status
Not reviewed
Pregnancy
Caution
Sensitization risk High

Banned in the European Union. Classified by the SCCS as a Category 1B carcinogen and reproductive toxicant. IARC lists it as a possible carcinogen, and the FDA has prohibited its use in food products.


Your Skin

No Normal
No Dry
No Oily
No Sensitive
Irritancy High
Comedogenicity Unknown

Our Assessment

Avoid

A hazardous sensitizer and prohibited substance with no justifiable benefit in precision skincare.


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