Re: pH of hair, skin

[Guest guest]

hi mark

this is stuff i am looking into at the moment as well. i don't think it is the

ph that is causing the sting. you are right in the ph levels. if you are looking

at a different acid boric is use in soaping to help neutralise free Koh wich is

an alkaline maybe this is a consideration.

nic

mark_risher wrote:

I'm new to the group, and have a question about target pH of lotions

and hair products.

As I try to learn by analyzing and testing some sample formulations

from various web sites, I have found a number of formulations where

the oil phase has a pH of 5-6. The water phase called for a gram of

Citric Acid (presumably an [anti-]chelating agent], which would have

pushed my pH further down.

[Guest guest]

Thanks for the reply; are you suggesting adding raw Koh to the water phase

to neutralize back to pH=7? Though the pH of the suspension would be 7,

wouldn't there be a strong and painful base floating around in the water

layer?

/m

_____

From: Churchward

hi mark

this is stuff i am looking into at the moment as well. i don't think it is

the ph that is causing the sting. you are right in the ph levels. if you are

looking at a different acid boric is use in soaping to help neutralise free

Koh wich is an alkaline maybe this is a consideration.

nic

[Guest guest]

to bring it back to 7 most people use naoh which is the alkaline used to make cp

soap. the reference to koh was for boric acid and its use in bringing the ph of

liquid soaps down. ie used in place of citric acid. but these are very small %

you are useing.

nic

mark risher wrote:

Thanks for the reply; are you suggesting adding raw Koh to the water phase

to neutralize back to pH=7? Though the pH of the suspension would be 7,

wouldn't there be a strong and painful base floating around in the water

layer?

/m