One of the essences in Roper Klacks' laboratory that, when mixed, create his potions. Each one can be smelt, handled or listened to, in order to match it to the pictures in Klacks' spell book.

This is an essence of butterflies; knowing Klacks, he probably didn't use the humane method to make it. It smells of fresh flowers, feels like satin to the touch, and 'sounds' like fluttering wings.

Obtained next to the cauldron in the laboratory.

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