Perhaps i am wrong, but you are asking for ‚in vivo‘- application (stool specs, prepared fluids from GIT?) or histological staining of (paraffin-) embedded specs?
Which „silver staining“ you were thinking of ( please be a bit more specific and let us participate in your ‚practical’ experience and further thoughts and future planning of experiments)…Otherwise, for a first orientation try: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2570149/
Info in addition: naturally, there is a lot of more/ less specific literature out in the wild and one can start to support with grounded and sound consideration for „help“ when knowing more in detail about the task you‘re going to work with….😅😇😘