Not quite correct.
Your hair/skin is ph 4.5-5.5 It is acidic naturally.
On the ph scale 1 is most acidic, rising to 7 which is neutral, rising through the alkaline scale to 14, which is most alkaline.
For hair/scalp health, shampoo should have a ph of 5, which is acidic. A higher ph will cause hair to swell. Colour/bleach contain ammonia which is alkaline and purposely swell the hair to allow pigment molecules to oxidise. It is why it is so important to condition after a colour using a conditioner with an acid ph to shrink the hair back down and lock the new colour pigments in.
Anyway your eyes are alkaline, so an acidic shampoo would sting them, hence why baby shampoo is alkaline.
Bleach is ph 8-9, so please dont think 8 is mild alkaline. Hair remova cream is ph9-10 and that MELTS hair:lol:
Alkaline shampoos not only swell the hair, they also remove the acidic layer, or acid mantle (its correct name) on your skin/scalp. This removes essential antiseptic properties, and can cause reactions such as cradle cap.
Please can everyone check their science before posting please. Ta xx