Uranyl formate (UO2(CHO2)2·H2O) is a salt that exists as a fine yellow free-flowing powder occasionally used in transmission electron microscopy.

It is used as a negative stain in transmission electron microscopy (TEM) because it exhibits a finer grain structure than uranyl acetate.

However, uranyl formate does not easily dissolve, and once in solution, it has a limited lifespan as a stain.

Typical aqueous solution concentrations are 0.5% or 1%.

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