How do I get vile powder?

It can be crafted from Vile Mushrooms or can be purchased from the Dryad for 1 each, during a Blood Moon in a Corrupt world. Vile Powder can be used to spread the Corruption onto convertible tiles.

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How do you make throwing powder?

Ingredients
  1. 1 cup corn starch.
  2. 1/3 – 1/2 cup water.
  3. 1 container icing color 1 ounce. I used Wilton icing colors, but any food dye can work well.
  4. mixing bowl.
  5. latex gloves.
  6. blender or food processor.