Oil redO is the most popular techniques for staining fats.But during long storage of stained sections(in my expierence itwas about 0.5-1 year),they loose their colour.I prefer Sudan Black.
And: results are the discriminating value for choosing this one or that one...
But: for me not only in the case of citing and posting commercial sources I think it would be honest and GSP () to cite also the source from which you are citing (or copying) (even if from the hidden URL's in the text one can see from where it was taken).
In the case of your posted file this should be (not only for copyright reason! cf.: > : http://www.emsdiasum.com or, more precisely http://www.emsdiasum.com/microscopy/products/histology/lipid_fat_stains.aspx
Also, IMHO, a personal disclaimer (e.g. , etc.) should be added.
your recent posts for me are welcome too. I would like to add here only that there have been o lot of other posting threads on the issue "Lipid&Fat Staining" (guessing you want to stain sections from either Formaldehyde fixed tissue (or cryosections too, the latter would imply to think over again about "the best" staining dye), but -as stated very often in these other threads - and quality of fat/lipid stainings always depend on the "real" retention of those substances in fixed tissue material (since most of it will be lost during processing).
cf, e.g.(not exhausting): https://www.researchgate.net/post/Is_there_any_suitable_staining_method_protocol_for_lipids_in_paraffin_sections or