Science
Mechanism of Action
This colorant functions by absorbing specific light wavelengths, notably around 630-640 nm. In hair dyes, it adheres to the hair shaft surface via electrostatic interactions, acting as a non-oxidative direct coloring agent.
Research
Clinical Evidence
Low confidenceN/A
Key findings
- 01 Dietary NOAEL (No Observed Adverse Effect Level) established at 1-2% in a 104-week carcinogenicity/toxicity study.
- 02 Oral challenge tests showed hypersensitivity reactions in 1-14% of sensitive individuals with asthma/urticaria (not directly relevant to topical application).
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Highly water-soluble and stable under normal storage and heat. It exhibits fair light fastness and poor oxidation fastness. Above pH 3.0, it appears deep blue, turning yellow-orange below pH 0.8.
Conflicts
- Strong oxidizing agents
- Manganese dioxide
- Persulfates
- Certain metal ions (Copper/Iron can cause a dark green discoloration)
Safety
Safety Profile
The FDA permanently lists Acid Blue 1 as safe for foods, drugs, and cosmetics, including the eye area (21 CFR 74.101, 74.1101, 74.2101). In the EU, it is permitted in all cosmetics without specific concentration limits, provided purity standards are met.
Your Skin
Skin Compatibility
Our Assessment
Verdict
A widely approved and well-tolerated synthetic blue colorant, providing aesthetic value without offering direct skin benefits.
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References
Sources