Sue Has A Colorful Question:
Is there any really any difference between brands of Type 3/Permanent at-home hair colour? Some stress non-fading, others a natural look, but they all apply the same way (apply/wait/rinse out/condition). Post-colour conditioners seem the same to me, too. Are they? 
The Right Brain Has A Written Response:
The technology of all permanent hair color is basically the same – you mix tiny, colorless chemicals (called monomers) together with an activator that causes them to connect together to form larger molecules (called polymers – “mono” means one, “poly” means many, get it?)
Since monomers are tiny, they penetrate your hair very quickly. Once they’re inside the hair and connect together to form the bigger polymers which are too large to get back out of the hair. Plus (and here’s the good part) the polymers are chemically designed to create different shades of color. So, these big, colorful polymer molecules stay trapped inside your hair, making it a gorgeous shade of red or brown or blonde until your roots grow out. While each company has it’s own special formulas, the basic chemistry of the dye molecules is the same.
As far as the post-color conditioner is concerned, let’s just say that the basic technology of these conditioners is essentially the same as regular rinse out conditioners. There are some differences – for example, post color conditioners may be modified with higher levels of silicones to fight the drying effects of the coloring process – but there’s no “magic” about these conditioners.
Having said all that, our point is NOT that all products are the same. Different companies have different approaches to formulating that can make their products work better or worse. But there’s no way to know for sure what you’ll like for YOUR hair unless you try it. That’s the beauty of the hair care industry – it’s part science and part art.
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