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CI 58000.

Questionable CAS 72-48-0 / COLORANT

A synthetic organic colorant, historically known as Alizarin, utilized to impart deep red tones to cosmetic formulations. While it provides high-impact visual aesthetics, it serves no therapeutic or physiological function for the skin barrier.

colorant

Science

Functions as a topical pigment that deposits color onto the surface of the skin, hair, or nails by absorbing specific light frequencies, resulting in a visible red hue.


Research

Low confidence
Effective range N/A
Optimal

N/A


Transparency

Not commonly dusted

As a high-intensity dye, it is used in minute quantities to achieve desired aesthetic shades; it is not a performance active subject to 'dusting' in the traditional sense.


The Formula

Solubility
Both
Optimal pH 5.5 – 6.8
0 7 14

Stability

Highly sensitive to pH shifts; it transitions from yellow to violet between pH 5.5 and 6.8, and reaches purple tones at highly alkaline levels (pH 10+).

Conflicts

  • Alkaline environments
  • Hair dye formulations

Safety

CIR Status
Not reviewed
Pregnancy
Caution
Sensitization risk Moderate

Classified as a suspected endocrine disruptor and potential allergen. Regulatory bodies like the FDA and EU strictly prohibit its use in hair dye products due to toxicological concerns.


Your Skin

Yes Normal
Yes Dry
Yes Oily
No Sensitive
Irritancy Moderate
Comedogenicity Unknown

Our Assessment

Questionable

While effective for aesthetic tinting, its profile as a suspected endocrine disruptor and skin irritant makes it unsuitable for sensitive skin or health-focused precision skincare.


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