dating patient ethics - Vintage necklace hardware dating

This will give you the advantage of being in pole position to contact the seller.

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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 tintypes and ambrotypes), camphor, and vegetable oil so it could be rolled into sheets and adhered to cloth, making the resulting material waterproof.

Unfortunately, Parkesine proved brittle, its key ingredient, collodion, was highly...

Less expensive to produce than Bakelite, Galalith, and Catalin and more chemically stable than celluloid, Lucite made these earlier jewelry plastics obsolete.

In its pure form, genuine Lucite is translucent, resembling glass or rock...

Over the past two decades, we have all become fatter.

In 1994 in Denmark, 7% of women and 8% of men were classed as obese. This is according to a study carried out by the National Institute for Public Health.

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