Roman alum
noun
: alum crystallized in cubes
especially
: alum formerly made from alunite at Tolfa near Rome that was reddish because of a very small amount of iron oxide though otherwise very pure
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“Roman alum.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Roman%20alum. Accessed 29 Nov. 2024.
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