As a latecomer to the game, I've only recently started hard mode. I haven't had a huge problem yet with the crimson spreading, but I am trying to keep my jungle area safe at the moment (the jungle and crimson spawned right next to each other). The crimson had spread somewhat into the jungle, but I dug a hellevator 3 blocks wide far beneath where the crimson met the jungle, and then I purified (or thought I purified) the bit of crimson on the jungle side of the hellevator. But some time later, the crimson had come back to the jungle, across the hellevator. I've looked around online about how to purify crimson/corruption, and can't seem to find out what I did wrong. When purifying, used some purification powder, but also sometimes just used my drill to get rid of crimson grass and crimstone blocks. Does drilling not work? Or am I missing something else? I'm not interested in purifying the whole world, but I do want to keep my jungle safe, and I also have another bit of crimson creeping up on my base, so I'd like to make sure I do it right this time.