Darkfield illumination is interesting because it shows many of the minute details.
We have sets of photographic filters available for minimal cost. Please contact me off line for further information. I will have to locate his information and send it to you. Impregnation in Amman's lacto-phenol and subsequent mounting in glycerin jelly acc. It's sometimes possible to stain exoskeletons of mites with Mayers hemalum, Grenachers boraxcarmine or hydrochoric acid carmine.