Lower PH for soap bars
Hi, can you please help making suggestion on what can I use to lower PH for soap bar that doesn't effect the hardness of the bar (I tried critic and lactic acid, it sure didn't work as it soften the bar)
I currently got PH of 7-8 and would like to lower it to 5-6 please.
Please noted that this is a facial bar, that's why I want lower PH than usual bar use for body.
Thank you for your help