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Purpurin (glass)
Purpurin (Italian: ''Porporino''; Latin: ''Haematinum'', derived from Greek ''haimátinos'' = "of blood"; German: ''Hämatinon''), sometimes referred to as ''glass porphyr'', is an opaque glass of brownish to lustrous deep-reddish color which in classical antiquity was used for residential luxury objects, mosaics and various decorative purposes. Purpurin is somewhat harder than normal glass but can be easily cut and polished. Its red color is permanently lost upon smelting. The material bears some resemblance to goldstone.
== Historical references and archeology ==
Purpurin artifacts are frequently found during archeological excavations of more affluent Roman settlements, often along with actual Roman glass; Pompeii is a prime example.
Pliny the Elder reports in his Historia naturalis: "Obsidian is made by artificial coloring and used for dishware, and also a completely red and opaque glass called haematinum."〔Naturalis Historia liber XXXVI, chapter 68: ''Fit et tincturae genere obsianum ad escaria vasa, et totum rubens vitrum atque non tralucens, haematinum appellatum.''〕 The art of making this type of glass seems to have originated in India; glass beads of a similar material have been found in the Indus valley and were dated to the late 2nd millennium BCE.〔Gowlett, J.A.J.: High Definition Archaeology: Threads Through the Past. page 276–277 Routledge 1997. ISBN 0-415-18429-0〕
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