Definition of alum cake
: a product of the action of sulfuric acid on clay consisting chiefly of silica and aluminum sulfate
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“Alum cake.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/alum%20cake. Accessed 19 May. 2022.
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Time Traveler for alum cake
The first known use of alum cake was in 1836
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