How can I dilute 70% glycolic acid to 35% since i am a first time user. And also time to keep it on my skin?

Thanks for your query. You should always get peels done from a doctor as there is a high chance that you might end up giving a burn or post inflammatory hyper pigmentation especially when you are dealing with acid peels. You can dilute glycolic acid with distilled water .to make it 355, you can take half acid and half peel. Hope it helps.All The Best

Hi, and thanks for your question. I recommend only having glycolic acid peels (especially stronger ones) performed by a board-certified dermatologist. Best, Dr. Frucht.

first and foremost you should not be doing this yourself. you are not a doctor or a pharmacist and you cannot even be sure what you have. Don't try it--you are fooling with acid.  go see a board certified dermatologist