1-HYDROXYETHYL 4,5-DIAMINO PYRAZOLE SULFATE

📋 Quick facts

Description: 1-HYDROXYETHYL 4,5-DIAMINO PYRAZOLE SULFATE — HAIR DYEING.

All Functions: HAIR DYEING

Quick Facts:

• Category: other

Proven Benefits At A Glance:

• 1-Hydroxyethyl 4,5-Diamino Pyrazole Sulfate is a chemical used in oxidative hair dyes
• An expert safety panel concluded it is safe when used in hair dye products at current concentrations
• The safety assessment was published in the International Journal of Toxicology in 2022

📊 Comedogenicity

🛡️ Safety rating

Safety tier is a starting heuristic from regulatory status and comedogenic rating, not a dermatological verdict — see our Terms for the full disclaimer. Research confidence reflects how many real cited studies back this ingredient, not the strength of their findings.

🌍 Regulatory Status

💧 Skin Type Compatibility

⚠️ Don’t Combine With

📚 Research & Evidence

🔬 The Science

1-Hydroxyethyl 4,5-Diamino Pyrazole Sulfate is a colorant precursor—meaning it’s a chemical that helps create color in hair dye products through an oxidative process (a chemical reaction that develops the pigment). According to the International Journal of Toxicology, an independent Expert Panel for Cosmetic Ingredient Safety reviewed safety data on this ingredient and determined that #1: it is safe for use in oxidative hair dye formulations at the concentrations currently being used in products. The Panel’s conclusion was based on a review of relevant safety data, though the abstract does not specify which particular studies or test results informed their decision.

It’s worth noting that this assessment applies specifically to hair dye use—the research does not address whether this ingredient would be safe in other types of skincare or cosmetic products.

📄 Related Research

Matched by search — not necessarily verified support for every statement above.

• Burnett CL et al. (2022). Safety Assessment of 1-Hydroxyethyl 4,5-Diamino Pyrazole Sulfate as Used in Cosmetics. Int J Toxicol.

🧴 Products Containing 1-HYDROXYETHYL 4,5-DIAMINO PYRAZOLE SULFATE

• CONAXESS TRADE NORGE AS Brillance Hårfarge 872 Intense Red
• CONAXESS TRADE NORGE AS Live Urban Metallics U69 Amethyst Chrome
• Henkel, Palette, Schwarzkopf Palette Salon Colors 4.89
• Nutrise untra colour
• live hairdye