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Moumoujus

FLUORESCENT BRIGHTENER 393.

Avoid CAS 1533-45-5 / COLORANT

Fluorescent Brightener 393 is an optical agent that absorbs invisible ultraviolet light and re-emits it as visible blue light. This mechanism creates an optical illusion, neutralizing yellow undertones to make the skin appear brighter, whiter, and reducing the visual prominence of shadows. However, its use in skincare is associated with significant safety concerns.

Summary

Optical Brightening Visual Brightening Shadow Reduction

Science

Mechanism of Action

On the skin, Fluorescent Brightener 393 functions by absorbing ambient invisible ultraviolet (UV) light and subsequently re-emitting it as visible blue light. This emitted blue light optically neutralizes yellowish undertones, thereby creating an illusion of enhanced brightness and whiteness. For cosmetic applications, this can visually diminish the appearance of dark areas or fine lines and confer a radiant glow.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Oil
Optimal pH 3 – 10
0 7 14

Stability

Fluorescent Brightener 393 demonstrates robust stability, characterized by a high melting point between 357°C and 360°C, good heat resistance, and low volatility. However, its integrity may be compromised in environments with pH levels below 3 or above 10.

Conflicts

  • Strong oxidizing agents
  • Reducing agents (e.g., sulfides, sodium hydrosulfite)
  • Heavy metal ions
  • Hard water (calcium and magnesium ions can form insoluble complexes, reducing effectiveness)
  • Antioxidants
  • UV absorbers (may react, leading to deactivation)

Safety

Safety Profile

CIR Status
Not reviewed
Sensitization risk High

While Fluorescent Brightener 393's specific cosmetic safety status is not explicitly stated, the FDA prohibits Fluorescent Brightening Agents (FBAs) as color additives in food. Concerns exist regarding the persistence of FBAs on human skin for extended periods, which may lead to irritation. Furthermore, repeated skin exposure to FBAs in conjunction with UV radiation has been associated with carcinogenesis in mice. The ingredient is classified as 'Xi - Irritant' with risk codes '36/37/38', indicating irritation to eyes, respiratory system, and skin, with safety instructions advising avoidance of contact with skin and eyes.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Avoid

Despite its optical brightening effects, the substantial safety concerns, including documented irritation, skin persistence, and potential carcinogenicity under UV exposure, dictate that this ingredient should be avoided in skincare formulations.

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