The formation of wax crystals in paraffin blocks containing material for microtoming is a common source of annoyance. As a result of various trials, I have found that the following simple method eliminates the trouble, at least in so far as the various types of wax used in this department are concerned.
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BROUGH, P. Avoidance of Crystal Formation during Embedding of Plant Material in Paraffin Wax. Nature 144, 250 (1939). https://doi.org/10.1038/144250b0
American Journal of Botany (1941)