Hello!
First of all, have you been tested for possible allergies to hydrogen peroxide, ammonia and Potassium persulphate? All of these are usually found in bleach and as far as I know chemically not related to PPD itself.
Have you been tested for PPD?
I'm allergic to PPD and I use "pure" bleach without any toner what so ever.
I don't use any cap but I avoid getting it on my scalp since bleach burns regardless of allergies.
Non permanent dyes (except for henna) almost always contain coal-tar or azodyes.
Some people (10% if I'm not mistaken) with PPD-allergies react to those aswell.
Don't know if it's risky (regarding possible future cross-reaction) or not to subject oneself to these dyes, but in my case I've decided not to take the chance.
Also I kind of like my new blonde look
/Hamuchi
Good PPD-allergyfacts:
http://www.dermnetnz.org/dermatitis/paraphenylenediamine-allergy.html
