"Useful for some potions, including Shrinking Solution."

Rat spleens serve as a common potion ingredient. They can be used whole or liquefied. It is a required ingredient in the Shrinking Solution and in Dragon dung Fertiliser.[1][3]


In 1993, Neville Longbottom added too many rat spleens and too much leech juice into his Shrinking Solution in third year Potions class, making it poisonous. Hermione Granger helped Neville fix the potion before Professor Snape had a chance to test it on Neville's toad, Trevor.[2]


Notes and references

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