(Desktop, Console and Mobile versions) Pink, Purple and Red Ice Blocks can only be used in the crafting of Ice Torches and their respective Hallowed, Corrupt and Crimson Torches.
Pink, Purple and Red Ice Blocks cannot be used in conjunction with, nor as a substitute to, Ice Blocks, and as such must be converted beforehand if usage is desired. Note that only normal Ice Blocks can be used in most crafting.