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However, in many contexts foragers do appear to have manufactured smaller beads compared to pastoralists. [ 11 ] Between the period of 50 - 33 thousand years ago, a study by Miller and Wang suggests that the style of ostrich eggshell beads was nearly identical in eastern and southern Africa, though these styles diverged in later periods. [ 3 ]
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Some fish and amphibian eggs have thick, leathery coats, especially if they must withstand physical force or desiccation. These types of eggs can also be very small and fragile. [citation needed] While many reptiles lay eggs with flexible, calcified eggshells, there are some that lay hard eggs. Eggs laid by snakes generally have leathery shells ...
The oldest eggshells, decorated with engraved hatched patterns, are dated for 60,000 years ago and were found at Diepkloof Rock Shelter in South Africa. [2]In Egypt, it is a tradition to decorate boiled eggs during Sham el-Nessim, a spring-ushering national holiday celebrated by Egyptians regardless of religion, which falls every year on the Monday following the Eastern Christian Easter.
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The waste eggshells are put into water and then ground to separate the eggshell from the protein membrane. [10] Then the ground eggshell is placed in a separate vessel where air is injected into the water flow. The air and water mixture causes the lighter component (protein membrane) to float and the heavier (calcium carbonate eggshells) to sink.
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