白魔也使用一些以太ethers。
在莎翁的戏剧《麦克白》中，他写到有三个巫婆围着她们的魔药，并且吟唱着：“不惮辛劳不惮烦，釜中沸沫已成澜”。
In his play Macbeth Shakespeare has his three witches hovering over their mystical brew chanting “double, double toil and trouble; fire burn and cauldron bubble.”
马尔福沉着脸打开了他的《高级魔药制作》，再明显不过的是，他认为这门课是白耽误工夫。
Malfoy opened his copy of Advanced Potion-Making with a sulky expression. It could not have been plainer that he thought this lesson was a waste of time.
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