Solutions

Solution is ammunition used by the Clentaminator. Different colored solutions will create and/or destroy different biomes. There are five types of solution currently available.

Solution sold by Steampunker NPC (depending on the biome she's in:)
 * when no other solution is being sold. Spreads the purity. In addition to turning all dirt-based biomes into normal grass biomes, spraying it onto Mushroom Biome grass will change it into Jungle biome.
 * during a Blood Moon or Solar Eclipse if the world has Corruption. Replaces all dirt-based biomes with Corruption.
 * during a Blood Moon or Solar Eclipse if the world has Crimson. Replaces all dirt-based biomes with Crimson.
 * when in the Hallow. Replaces all dirt-based biomes with Hallow.

Additionally, the Truffle sells, which can turn any Jungle into Mushroom Biome.

Keep in mind that when using the Purple, Red, or Blue solutions, Mud will be replaced with dirt along the surface to accommodate grass blocks - this process is currently not reversible.