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In the middle ages, salt production through evaporation involved boiling brine and using egg white or blood as a coagulant for precipitating marlstone - how did this coagulation work?

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In the middle ages, salt production through evaporation involved boiling brine and using egg white or blood as a coagulant for precipitating marlstone - how did this coagulation work?	15
Why does the Milky Way appear in the night sky in the way that it does?	1