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Do I capitalize words that used to be proper nouns?

Common Nouns

Some expressions that originally contained proper nouns are now common nouns and are not capitalized.

charley horse
plaster of paris
manila envelope
bone china
napoleon (the dessert)
boycott
diesel
macadam
ampere
watt
joule
kelvin
texas leaguer
arabic numbers
roman numbers (but: Roman laws)

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