What does the Grand High Witch plan to use to turn the world's children into mice in the novel, The Witches?

Formula 86 Delayed Action Mouse-Maker is the formula by which the Grand High Witch hopes to turn the children of the world into mice. This formula is made up of a combination of strange and vile ingredients, such as alarm clocks, 45 brown mice tails boiled in hair oil, frog juice, and the tongue of a catspringer among other things. When brewed to perfection, the formula achieves a yellowy-green color and slimy texture.