[evelynquee]

Thanks so much for the contribution @Gunther , @sven , @ngarayeva001 and @Pharma . I guess I still have to return to the drawing board. I appreciate you all. I learned a lot from the contribution. 

[evelynquee]

I indicated that my targeted pH level is 12.5-13.5

[evelynquee]

I Gunther said:

You just don’t add 4% pH just like that
you need a target pH, otherwise it may end up dissolving people hair, and possibly damaging their scalp too.

Try to see if you can make a buffer solution
https://en.wikipedia.org/wiki/Buffer_solution
that keeps pH from fluctuating too much.

I read the article but didn’t understand the practical way forward.
Can I just carry out some experiments? After production before the addition of sodium hydroxide, can I just use a pH meter to be testing the product till I reach the actual range I am looking for?
Is the pH level I indicated for the relaxer okay?
Thanks so much.

[evelynquee]

Gunther said:

You just don’t add 4% pH just like that
you need a target pH, otherwise it may end up dissolving people hair, and possibly damaging their scalp too.

Try to see if you can make a buffer solution
https://en.wikipedia.org/wiki/Buffer_solution
that keeps pH from fluctuating too much.

Thanks so much. I will work on it.