But glacial acetic acid, 99.7%, is corrosive and can burn skin on contact.
In college, I studied the Dye Transfer photography process. For one part of the process, we used glacial acetic acid, but I don't remember the dilution. IIRC, it was to "eat away" the part of the gelatin emulsion that had not been exposed.
My dad was a PhD chemist. I was asking him about the various chemicals we used. That was one he told me to be very careful with.
Sadly, Kodak discontinued making all the films, papers, and chemistry for Dye Transfer in 1993. Another one lost to the digital age.