Just to add to this from a customer's perspective.

I had the INOA hair colour about a year ago rather than my usual ammonia-based colour and it was the most unpleasant experience I have ever had at a salon,

Even though I'd had a patch test about a week before for this new product the product was very itchy and irritating as it sat on my scalp for 40 mins or so. Then the removal was even worse. The product needs to be emulsified before it can be rinsed off and this involved the assistant having to vigorously rub my hair and scalp for probably 5-10 mins. On top of an already irritated scalp that was just awful.

The colour was nice enough and condition of hair OK - and there was no lasting irritation on my scalp from the procedure. But my scalp was sensitive for about a week or so and needless to say I have now gone back to my usual hair colour system.

Ghastly...