Empathy for Weak Magic
Project info

“He [the Wizard] first set up a small silver tripod and placed a gold basin at top of it. Into this basin he put two powders – a pink one and a sky-blue one – and poured over them a yellow liquid from a crystal viral. Then he mumbled some magic words, and the powders began to sizzle and burn and send out a cloud of violet smoke that floated across the river and completely enveloped both Trot and Cap’n Bill, as well as the toadstools on which they sat, and even the Magic Plant in the gold flowerpot. Then, after the smoke had disappeared into air, the Wizard called out to the prisoners:
“Are you free?”
Both Trot and Cap’n Bill tried to move their feet and failed.
“No!” they shouted in answer.”

L. Frank Baum, The Magic of Oz, Books of Wonder, HarperCollins Publishers, New York, NY 1919, P. 209-210