Toluene-2,5-Diamine Sulfate
Toluene-2,5-Diamine Sulfate is an aromatic amine compound used as a primary intermediate in permanent hair dyes. It reacts with other chemicals to create long-lasting hair color. It is often used as an alternative to p-phenylenediamine (PPD) in hair dye formulations.
NoneHair dye ingredientVeganEvidence: High
RiskSerious 3.5 / 4
Sensitization i3.5 / 4
Risk of allergic contact dermatitis or immune-based reactions. Fragrance allergens, preservatives, botanicals, and some dyes may score here.
Irritation i2.5 / 4
Risk of short-term irritation — stinging, burning, dryness, redness, or discomfort. Common for strong actives, acids, retinoids, fragrances, and harsh surfactants.
Systemic exposure i1.5 / 4
Whether it has meaningful potential to be absorbed into the body at levels that may matter biologically. Most cosmetic ingredients score low unless there is known concern or high exposure.
Rated by SpottyLabs' ingredient methodology, independent of brands.
Things to watch
- Known sensitizer, can cause allergic reactions
- Potential for skin irritation
- Possible mutagenic effects
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Products with Toluene-2,5-Diamine Sulfate
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Frequently asked questions
- What is Toluene-2,5-Diamine Sulfate used for?
- Toluene-2,5-Diamine Sulfate is a common ingredient in permanent hair dyes. It acts as a color precursor, reacting with other chemicals to develop the desired hair color that lasts through multiple washes.
- Can Toluene-2,5-Diamine Sulfate cause allergic reactions?
- Yes, Toluene-2,5-Diamine Sulfate is a known sensitizer and can cause allergic reactions, particularly in individuals sensitive to hair dyes. A patch test is strongly recommended before each use of hair dye containing this ingredient.
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