Microtomy

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I need to infiltrate a sample block of wood for sectioning on a microtome. The formula for the infiltrating media is 70% Ethylene Glycol 1500 and 30% Lauric acid. Both components are in a powder form. The instructions don't indicate whether this is supposed to be a weight/weight ratio or a volume/volume ratio or otherwise. Thoughts? Thanks. BTW, the theory is that the combination of the two make for easier to handle and flatten sections when placed on the slide.

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