— Item examination - Japanese
"A chemical that could be used to melt a special alloy."
— Item examination - unofficial translation
The Purple Chemical (紫の薬品 murasaki no yakuhin ) is an item which was intended to appear in Resident Evil 0 during its GameCube stage of development but was removed in the final release. You can get it in the Biohazard 0 TRIAL EDITION with the help of cheat devices such as Action Replay MAX or GameShark; however, it is not usable anywhere and lacks a 3d model as well.
It is possible that the Purple Plant was supposed to be used to create this item.