Original Message:   1942 recipe for selenium cadmium sulfur ruby glass
http://onlinelibrary.wiley.com/doi/10.1111/j.1151-2916.1942.tb14360.x/abstract I can see how this might not have gotten into production in China until after 1949. Here's a more explanatory link: https://www.google.com/patents/US2418684 Copyright 2024 All rights reserved by Bead Collector Network and its users

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