Pyrazole

[krisko]

What exactly is pyrazole... a molecule... a pigment... and isn`t it patented by Wella? If so why it`s used by other companies and even box colors?

 

[AcidPerm]

A quick google tells me that Pyrazole is an organic compound and derivatives of it are widely used in medicines so I don’t see how Wella could patent a compound that was invented/discovered about 150 years ago.

 

[krisko]

I talk about "1-Hydroxyethyl 4,5-Diamino Pyrazole Sulfate". Don`t know if it`s the same... but they named their P5 reds after pyrazole... and definitely think it`s patented...

 

[A&F David]

Hydroxyethyl 4,5-diamino pyrazole sulfate is commonly used as a component of oxidative hair dyes.2 This ingredient acts as a “precursor” and reacts with a “coupler.” In a typical formulation, a precursor is activated via an oxidant, such as peroxide. The resultant activated precursor proceeds to react with a coupler to form in-situ a product that is purported to be the actual dye that colors hair in these types of oxidative hair dyes” and it is not patented.