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https://www.collectorsweekly.com/costume-jewelry/celluloid
Vintage Celluloid Jewelry. Overview. eBay (721) Magazine. Show & Tell. Patented in 1869, Celluloid was not the first man-made plastic—that honor goes to Parkesine, which was formulated in 1865 by a Birmingham, England, inventor named Alexander Parkes, who combined collodion (used in …
http://www.midcenturyjewelry.com/how-to-identify-celluloid-jewelry/
Jan 20, 2009 · Celluloid was manufactured as an early plastic. Jewelry made of celluloid dates to about 1900 and was quite popular during the Art Deco period. It is a lightweight plastic, many times a cream color. Sometimes the cream celluloid is painted to add color, though. In the 1950s, a lot of celluloid jewelry was manufactured in Japan.
https://www.marketsquarejewelers.com/blogs/msj-handbook/history-identification-bakelite-vintage-plastic-jewelry
Aug 07, 2020 · The Basics: Celluloid vs Bakelite Jewelry. All plastics can be differentiated by how they respond to heat. Celluloid and other natural plastics can be heated and softened over and over again to return them to a moldable state. This category is called thermoplastic. Bakelite, once hardened, can never return to a moldable state.Estimated Reading Time: 5 mins
http://www.collectics.com/education_plastic.html
Celluloid was one of the first plastics to be widely used in making jewelry. Celluloid was originally developed in England in the 1850s but first commercialized in 1868 by John Wesley Hyatt, whose company eventually became the American Celluloid and Chemical Manufacturing Company-- subsequently the Celanese Corporation.
https://www.citrusavenue.net/jewelry-articles-information/how-to-identify-vintage-celluloid-bangle-bracelets
Celluloid jewelry and other household celluloid items manufactured prior to that time can, literally, burst into flame if exposed to open flame or high heat. We know, however, that floral motif celluloid bracelets such as the ones pictured can generally be attributed to the 1930s-40s or so and thus exploding bracelets are probably no threat.
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