Is there a reason that oil (e.g., vegetable or clear mineral) is not used to make wet mounts in microscopy? I am not referring to oil immersion technique but substituting oil for water in wet mounts in bright field microscopy.
The question is mostly about moss or mold, things that appear plantlike on a slide. The optical properties may be good and the viscosity, as with glycerine, gives a little depth to the slide. Maybe it causes some sort of distortion? I don't see this listed as a suggestion on microscopy sites.