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I'm looking at purchase orders and I see purchases for chemicals like the following.

Glutaraldehyde, EM Grade, 25%

What does the "EM Grade" mean in this text? It says that it's recommended for histological or immunological techniques, but how?

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It is highly purified, typically distilled into glass ampoules and sealed under an inert atmosphere. Suitable for use in *E*lectron *M*icroscopy.

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EM grade is a label for chemicals used in electron microscopy.

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