Talk:Hard Mode/@comment-42.241.19.34-20120523105944/@comment-4715278-20120527194330

Both the Corruption and the Hallow will spread, the best way to stop this is by using Vile Powder on the Hallow and Purification Powder on the Corruption.

An alternative is by using Holy Water, but it turns everything natural it comes into contact with into Hallow.