Phenyl Methyl Pyrazolone

AKA “MCI-186, MCI 186, RefChem:57584, edaravone, 89-25-8, 3-METHYL-1-PHENYL-2-PYRAZOLIN-5-ONE, Radicut, Norphenazone, 1-Phenyl-3-methyl-5-pyrazolone, Developer Z”

Ingredient

Ingredient Facts

Phenyl methyl pyrazolone

AKA: MCI-186, MCI 186, RefChem:57584, Edaravone, 89-25-8, 3-METHYL-1-PHENYL-2-PYRAZOLIN-5-ONE, Radicut, Norphenazone, 1-Phenyl-3-methyl-5-pyrazolone, Developer Z

Ingredient · Hair Dyeing · EWG: 4

Synthetic

Not Clean

3H-Pyrazol-3-one, 2,4-dihydro-5-methyl-2-phenyl-

Solubility less than 1 mg/mL at 73 °F (NTP, 1992)

Formula

C10H10N2O

Mol. Weight

174.20

CAS #

89-25-8

Form

Powder

State

1-phenyl-3-methyl-5-pyrazolone appears as white to off-white powder or crystals. (NTP, 1992)

See origin →

Functions

Hair Dyeing

Antioxidant Protection

Locks In Moisture

Fights Bacteria

Colors Hair

Traditional Use

A synthetic organic compound developed for use in cosmetic formulations, primarily as a stabilizer or preservative booster in modern skincare products. No significant traditional or historical use prior to modern cosmetic chemistry.