What medium is "Roundel with Allegorical Scene of Book Burning"?

Roundel with Allegorical Scene of Book Burning is Colorless glass, vitreous paint and silver stain.

Is "Roundel with Allegorical Scene of Book Burning" in the public domain?

Yes, Roundel with Allegorical Scene of Book Burning is in the public domain and available for free download under CC0 license.

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This artwork was created ca. 1520–30.

Unknown Artist, ca. 1520–30