"A strong acid that can dissolve certain metals."
Corrosive (金属溶解液 kinzoku yōkai-eki ) is an item in Resident Evil 7: Biohazard.
Corrosives are used to melt specific metal locks on doors, allowing access to what was locked.
A particular room with a picture frame puzzle and a vault will be given 3 Corrosives. Succeeding the puzzle will unlock the vault.
In the minigame Nightmare, Clancy can craft Corrosive at a workbench for a sizable amount of Scrap. the Corrosive is used to melt the locks on the doors leading to the Workshop and Morgue areas, which contain more Compactors.