Two techniques are proposed to minimize precipitate contamination of ultrathin sections after lead citrate
staining. According to the first one, stained and washed grids are placed, sections downward, on a stack of filter
papers. The second one involves a consecutive washing of grids with distilled water, 96 % ethanol, and hexane.
Both techniques are equally efficient; the former being simpler in processing, while the latter is superior in the
reproducibility of results.
Key words: ultrathin sections, lead citrate staining, contamination, cleaning
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