of bones from corpses? It is a relatively cheap and low maintenance method that also breaks down the connective tissue and joint structure leaving the bones well prepared for bleaching. (DON'T USE CHEMICAL BLEACHES AS THEY WILL BREAK DOWN AND WEAKEN THE BONES OVER TIME. use peroxide) The alternatives being dermestid beetles (high maintenance to keep a colony privately) or chemical treatments (expensive and requires facilities and equipment).
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Successive extraction of any plant part involves sequential extraction ( e.g. employing soxhlet apparatus or maceration) using solvents with increasing polarity. Following each extraction, the marc (refuse matter that remains after extract has been filtered) will be dried before being extracted using solvent with higher polarity. For example, the following solvents can be used in successive order (lower to higher polarity): petroleum ether then chloroform then ethyl acetate, then methanol.
Multiple extraction.
NO, well, you shouldn't. why even ask?
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