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Does tissue fluorese? Yes, there are several biological fluorophores that emit redder light once excited. See a short list with their excitation and emission wavelengths to the right:

A neat way to present fluorescence spectra is through an Excitation-Emission Matrix, EEM in short.

A theoretical map of the mentioned fluorophores is displayed below:
Excitation-Emission Matrix

Once we acquire the real data - it will look something like the following image, where Excitation-Emission Matrix, data

For a live tissue, the biggest problem is that signal-to-noise ratio is very small and biological variations are significantly bigger than the variations due to a condition explored.

Work was done while at Argose Inc.