Tainted Goo (Thaumcraft 4)

Tainted Goo is a component added by Thaumcraft 4. It is dropped by mobs and blocks found in the Tainted Lands biome. When in the player's inventory it has a chance to be automatically consumed and deal damage to the player—a means of quickly moving it to other inventories is high recommended. While it is not utilized in any recipes in Thaumcraft 4, some addon mods use it in some of theirs.