Colored with or containing bistre; tinted with the brownish pigment.
Past participle of the verb 'bistre' (to color with bistre) or an adjective formed by adding -ed to the noun bistre, following English word-formation patterns.
When art historians examine old drawings and say they're 'bistred,' they're essentially identifying them as having been worked on with soot-based ink—a fingerprint of Renaissance and Baroque artistic techniques.
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