I cleared a Crimson chasm, and found something I can't find anything about. What is this?

I cleared a Crimson chasm, and found something I can't find anything about. What is this? - Brown Steel Letter B Wall Decor

So I beat the Golem and finally decided to buy the Clentaminator to clear the world of most of the more troublesome hallow and Crimson.

While clearing the chasms I found this background area that doesn't seem to budge to anything. The Clentaminator doesn't purify it, the Pwnhammer doesn't smash it, and the Pickaxe Axe doesn't seem to have any effect on it. And while I did try searching for it on the web I didn't manage to find any info.

What is this thing?

Cave with background[1]

After posting, I managed to find another one under the other Chasm, and they are destroyable by using bombs (that destroy tiles) and dynamite. So I guess they're just background tiles as Sable Dreamer claims.

under the second Crimson Chasm






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What are the corrupt chasms in Terraria?

Corruption Chasm A Chasm in the Corruption is a long vertical pit beginning at the surface, dropping straight down into a dark abyss. The walls are made of Ebonstone, with Ebonstone Wall backgrounds. An intersecting horizontal tunnel generally connects Chasms near their bottoms, and contains several Demon Altars.

How do you completely purify Crimson?

Use Clentaminator with green powder and spray it on the crimson and Boom gone. Or use purification powder bought from the "dryad".



Crimson Chasm




Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: cottonbro, Mnz, Tima Miroshnichenko, Ann H