Up to the early 50s all plastic frames used in the eyeglass industry were made from cellulose nitrate (celluloid) sheets. This material was highly flammable and got replaced after a while of trying out other materials.
The industry settled on acetate (in the mid 50s) sheets and has forever stayed with that material as the main raw material for good quality optical eyeglass frames.
Acetate sheets are colored during the manufacturing process and should be stored nearly a year before working with. The material has to cure properly before it should be worked on.
Some manufacturers can not wait to throw some new colors in frames on the market and used to material to early. It then is to soft and will not keep it adjustments and will scratch easyly.
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