I want to know the answer to the following question:
Along with uranyl formate, what product of uranium is used in transmission electron microscopy?
All the background I'm provided with is that "Uranium was also used in photographic chemicals (especially uranium nitrate as a toner), in lamp filaments for stage lighting bulbs, to improve the appearance of dentures, and in the leather and wood industries for stains and dyes.". Is that enough to answer the question?