Colored, stained, or drawn with bister pigment; having the warm brownish tone characteristic of bister.
From bister + -ed (past participle suffix). Describes artwork or materials treated with or containing bister pigment, combining the noun with adjectival modification.
When museums label a drawing as 'bistered,' they're telling you it's likely centuries old and was made with actual soot—the best-preserved ones look like they were drawn yesterday!
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