Calcium Bentonite (aka Aztec Secret): 8 - 9.7
French Green (aka Illite Clay or Sea Clay): 7.75
Fuller's Earth: 7.5
Rhassoul (aka Red Moroccan or Red Clay): 7 - 7.5
Dead Sea Mud: 7
Kaolin (all colors): 6
Moor Mud: 4.5 - 5.5
I'm not sure if these numbers are correct or if it's even a valid measure, but I have noticed that french green clays cause more irritation than kaolin clay, and using apple cider vinegar to neutralize the pH makes the former less irritating.
For a french green clay mask, are there any ways to make it less irritating without losing it's oil drawing powers? Adding e.g. citric acid to balance the pH? Adding oils does help, but that seems to defeat the purpose of the mask.
It looks like you're new here. If you want to get involved, click one of these buttons!