Uranyless

Uranyless is a contrast solution that substitutes for uranyl acetate. As recommended by Reynolds (1963), it is highly advised to enhance the initial contrast (in this case, Uranyless) with lead citrate in a NaOH-saturated atmosphere to prevent contamination by atmospheric CO2.

To facilitate the use of lead citrate in your staining processes, it is packaged in AirLess bottles (without air, thus without CO2). You can store this 30 ml bottle for a long time without the risk of CO2 contamination, a common concern for all microscopists.