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Is this bird pin celluloid?
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<p>[QUOTE="Joan, post: 9439716, member: 5398"]Thank you Figtree, I think I have the book you mentioned, but I'm away from home for several days, so will see if I do when I get back. Yes, I was referring to shapes like the bird pin. It looks like a soft material was put into a 2-piece mold and then the two halves pressed together because of the seam around the edges that show where material squeezed out and wasn't cleaned off completely. It's kind of hard to see in the last photo. I just checked with wikipedia about when injection molding was invented and learned that the guy who patented the process for making celluloid in 1868, also patented the first injection molding machine. It also mentioned that soluble forms of cellulose acetate that were much less flammable became available in the early 1900s, so now I'm thinking that's probably what the pin is.[/QUOTE]</p><p><br /></p>
[QUOTE="Joan, post: 9439716, member: 5398"]Thank you Figtree, I think I have the book you mentioned, but I'm away from home for several days, so will see if I do when I get back. Yes, I was referring to shapes like the bird pin. It looks like a soft material was put into a 2-piece mold and then the two halves pressed together because of the seam around the edges that show where material squeezed out and wasn't cleaned off completely. It's kind of hard to see in the last photo. I just checked with wikipedia about when injection molding was invented and learned that the guy who patented the process for making celluloid in 1868, also patented the first injection molding machine. It also mentioned that soluble forms of cellulose acetate that were much less flammable became available in the early 1900s, so now I'm thinking that's probably what the pin is.[/QUOTE]
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