Purple Stone Tools
Identical to stone tools. But slightly purple.
Crafted with 1 purple dye surrounded by 8 of the stone tool you want.
Example: the pickaxe:
Having any of these tools in your inventory gives the 
Not Wide Purple Smooth Netherrack advancement.
Having the pickaxe gives 
Isn't It Purple Stone Pick. (see Isn't It A Pick)
Despite its name, the Not Wide Purple Smooth Netherrack advancement is completely unrelated to Smooth Netherracks.
Purging Service
You can wipe all Purple Stone tools from your inventory by typing /msg cl_purge_service into chat. If you successfully wipe a Purple Stone item, you will get the 
Good Samaritan advancement.
Note(s): this fake command doesn't autocomplete. It works with any permission level.
The removal of purple stone tools only works if the cooloolsPurgesericeEnabled gamerule is true. If it's false, no purple stone tools will be removed and you will get Good Samaritan for free.
See Colools lore for why colored stone tools can be purged.
Uranium Boat
The Uranium Boat has a Purple Stone stage. Only this stage can be purged with the Colools Purge Service and give the Not Wide Purple Smooth Netherrack advancement