|"Are you a wizard or not?"
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- "Wave your wand to complete the potion."
- —A standard final step for many potions.[src]
This spell is used throughout the process of brewing a potion, usually to complete it. It manifests as a white light, similar in appearance to lightning, which strikes the surface of the potion several times. Without this spell, no potion can be properly made, which is why Muggles cannot brew them.
Behind the scenes
- Despite J. K. Rowling claiming that every potion has a "magical component" and requires a wand at some stage, Pottermore is, as of currently, the only canon source to depict this aspect of potion brewing.