Dear Gustavo - your request honestly I answer as a first aid:

Have you used the (full text) SEARCH function in ResGate's archives of Publications, Researchers, Q/A and Projects already ?

If not, I recommend you to find the search field (THIS PAGE you are working right now, rectangle in the middle of upper menue line :

"Search for researchers, publications, and more"),

insert your keyword(s), or even phrases, then click the loupe icon. wait a second and retrieve information, choosing either 'Researcher', or 'Publications', or 'Projects' or 'Questions/Answers' ....

I think especially for a / the search phrase / key words :

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| sudan black autofluor |

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there are many results not only in section 'Q/A' .....

(the insertion of these keywords will create an URL:

"https://www.researchgate.net/search.Search.html?type=question&query=Sudan%20black%20%20autofluor".

you could vary your keyword setting, e.g.

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| sudan black autofluor lipofusc | or

| sudan black autofluor lipofusc quenching blocking brain |, etc. and so forth...in order to narrow results to your demand....

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Best wishes, good luck and have a nice weekend!

I found this interesting article: Article Sudan Black B Reduces Autofluorescence in Murine Renal Tissue

Thank you Wolfgang for you recommendation.