Hi,
I am having trouble with my Oil Red O stain for my rat MSCs. What is the best aqueous mounting medium to use? I followed the protocol from IHCWorld (http://www.ihcworld.com/_protocols/special_stains/oil_red_o_ellis.htm) and the Oil Red O solution was bought from Sigma. Under light microscopy it looks like there are lipids vacuoles but they are not staining red. Any idea why?