This all but guaranteed their success as one of the top colors for eyeglasses for Men and Women. No longer were round tortoise glasses the standard, as the cat eye shape took over. During the 1950’s they started manufacturing tortoise eyeglass frames out of acetate, a much easier and durable material to work with. Many of the early American tortoise frames were made of bakelite, a type of plastic that was better for frames than genuine tortoise glasses. In 1977 trade in genuine tortoise material was banned to help keep alive this endangered species. Hawksbill turtle is amongst the most critically endangered species of animal due to the mass hunting that occurred in the 19th and early 20th century. Early European round tortoise shell glasses were generally round in shape and made of genuine Hawksbill turtle shell.
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