Brew of Substitution

The Brew of Substitution is a throwable potion from the Witchery mod. This potion will replace a single block type in an area with a selected block. Drop any number of a single block near the work area, then throw the brew at the block type that you want to replace. As many blocks as were dropped will be replaced in a spiral pattern, and only those of the same block that the brew was thrown at.