In a nutshell, this describes the commercial aspects of Christmas in North American and probably most of the rest of the Western world.
Backing: the process of filling the shell with molten metal to form a printing plate.
Backing paper: liner on self-adhesive coil stamps that stamps are affixed to.
"A Howiesons Poort tradition of engraving ostrich eggshell containers dated to 60,000 years ago at Diepkloof Rock Shelter, South Africa". Proceedings of the National Acadademy of Science U S A. doi:10.1073/pnas.0913047107 PMID 20194764 ...
220 North, continue on 220 North to Exit 78B (Bellefonte 150 North)
Follow 150 North for 2.5 miles to Phoenix Avenue (there is a Shell Station on the right)
Turn left onto Phoenix Avenue and follow the parking lot all the way around to the back.
A duplicate coin created by the electrolytic method, where metal is deposited into a mold made from the original. The obverse and reverse metal shells are then filled with metal and fused together.
 See also: Stamp, Used, Series, Philatelic, Cover
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