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illuminant SUBST (instruments & machines)

illuminant

أَداةٌ مُضِيئَة

illuminant

مضيء

illuminant

منير

anglais

Whale oil was used as a cheap illuminant, though it gave off a strong odor when burnt and was not very popular. en.wikipedia.org

A blend of ethanol and turpentine added as an illuminant called burning fluid was also important for several decades. en.wikipedia.org

In reflection mode, this is often (but not always) taken as the of the perfect reflecting diffuser under that illuminant. en.wikipedia.org

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