Citifluor Aqueous poly(vinyl pyrrolidone) plus antifadent is very useful as a permanent mountant which possesses antifadent properties. A few drops of the solution should be applied to the specimen followed by a cover slip. The water evaporates to give a clear film which holds the cover slip in place thereby aiding the safe storage of the specimen.

The solutions are of medium viscosity and are slightly yellow in appearance. They have a pH of ~9.5. The solutions may be stored at room temperature. The cap of the bottles should always be replaced after use, to prevent evaporation of water which leads to film formation and ultimately to solidification of the product. Samples stored under these conditions for 6 months have been found to exhibit little apparent deterioration e.g. no gel formation.