Purification Powder

Purification Powder can be bought from the Dryad for 75 copper each and can be used to convert Ebonstone Block to Stone Block and remove corruption from Dirt Blocks. It transforms corrupted grass into normal grass and destroys corruption thorns. It is essentially the opposite of Vile Powder. Using this or dynamite is currently the only way to get to Shadow orbs and break them without having to defeat Eater Of Worlds.