When your restoring the PH to the skin, what your doing is "rebalancing" the lvl of moisture, sealing the hair cuticle, and restoring smoothness to the hair shaft. Your putting back and balancing what the chemical process removed. (oh and always do your "final" rinse with cool water. that seals up the cuticles beautifully and makes your hair VERY shiny.)
Your best bet is to either go to a "naturist" store, ask one of the clerks there what you could use, tell them what it's for, and what shampoo is best to restore the hair and skin. Or buy your stuff from a reputable hair salon (but that could get pricey) There is also Henna color, no idea if that is safe or not, I do know that it has advanced by leaps and bounds in the past 5 years. "Real" color and henna do not mix lol, you get either fushia or green when those two come into contact with each other. (REALLY funny to see, I saw it done on a mannequin.)
Reactions to color can vary, and it's usually a combination of, heat and amonia, heat and peroxide, peroxide content too high on a sensitive scalp, medication the client is taking, I could go on and on lol. Sometimes it's a light "rash", itching towards the back of the head lower neck hairline area, to blisters, bubbling, and yup burning/peeling hair loss.
When doing a color process make sure your in a well ventilated cool area, do not sit in the sun, or if it's your horse, keep him/her in the shade, heat makes it work harder and faster i.e more chance of something going wrong. And yes by all means ALWAYS do a patch test, but do not mix the whole "box" or whatever you'll be using and store it, make sure you mix in equal amounts of 1 ounce color 1 ounce developer for a patch test. Please use a scale to get exact weight
I still use one and i've been at this for a loooooong time lmao.
I'm not against color, i'm a colorist for heavens sake lol, what I hate is ignorance and self imposed ignorance. I'm glad your taking note of the info, and don't hesitate to ask questions no matter how inane you might think they are. Now when youll be ready to do a color change at your local hair salon maybe you can teach those hairdressers a thing or two, oh and always ask the stylist doing your hair if she's a certified haircolor technician before she starts the job, there is usually one or two techs on staff at every salon.