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One micron-thick sections of tissues fixed in glutaraldehyde, or in glutaraldehyde followed by osmium tetroxide, and embedded in a variety of plastic resins were stained in a methylene blue-azure II solution at 65 C, then counterstained in 0.05% basic fuchsin in 2.5% ethanol at room temperature (24 C). Considerable variation was found in methylene blue-azure II staining times for different embedding media. Aged Epon-812 required less staining time than freshly polymerized blocks of Epon-812. The procedure is a simple, rapid staining technique suitable for photomicrography and tissue orientation for electron microscopy.
Humphrey et al. (Tue,) studied this question.
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