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http://www.midcenturyjewelry.com/how-to-identify-celluloid-jewelry/
Jan 20, 2009 · In the 1950s, a lot of celluloid jewelry was manufactured in Japan. Celluloid can be quite distinctive looking, many times with rhinestones embedded into the jewelry or molded/carved into floral designs. Smell test: Hold your celluloid jewelry under hot water for 30 seconds. Now, put it up to your nose and smell it.
https://www.citrusavenue.net/jewelry-articles-information/how-to-identify-vintage-celluloid-bangle-bracelets
There’s no truly universal, fail-safe method for testing celluloid bangles. If the bracelet (or if any celluloid material, for that matter) is old enough, it may be the kind of celluloid that’s highly flammable. Non-flammable celluloid material (technically called ‘cellulose acetate’) was developed in the late 1920s.
http://www.collectics.com/education_plastic.html
Celluloid jewelry can be damaged by moisture, temperature extremes, or chemicals. Celluloid that has been stored in a closed environment for long periods can also dull quite dramatically and even crack. The best and safest way to test and identify vintage plastics is with simichrome polish which you can purchase at most hardware stores.
https://www.decolish.com/CelluloidJewelry.html
Celluloid Jewelry Types. Many Celluloid jewelry pieces survive, especially little brooches in the form of flowers, birds and animals. Dog brooches, especially terriers were very popular, I had one a while back which was a really cute Scottie dog with a nodding head. But it had one important flaw - …
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