We bought from eBay glass fish-shaped plates, manufactured by Arocroc (France) in 1970 or so. The listing had "unused" in the description but that is not certified. How does one kasher glass plates?
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The Sephardic opinion is that glass never absorbs, so it never has kosher issues.
Ashkenazic opinions vary; a lenient (albeit very authoritative) one is that of Rabbi Moshe Heinemann of the Star-K:
But as always, ask your rabbi!