1942 recipe for selenium cadmium sulfur ruby glass | |||||
Re: Chinese so-called "Peking" Ruby Red Glass Beads - pre WWII vs 1990s -- beadiste | Post Reply | Edit | Forum | Where am I? |
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
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