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Stopping the Corruption Hallow Spread

I was just wondering if there is a way to stop the Hallow and Corruption from spreading past a certain area once you convert your world to hard mode (killed the WoF). I want to keep an area of normal terrain around my house without having to go through the trouble of corrupting it (unholy water) then cleansing it (purification powder). I just want to know if there is a way, perhaps a copper brick barrier or something, that would effectively stop the spread of both Hallow and Corruption.

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