[Histonet] Trichrome Staining Intensity

[Albert Grobe]

Some time ago, I found a paper that stated that the intensity of the blue color in the Masson's Trichrome stain was proportional to the amount of cross-linking, i.e. older, more cross-linked collagen was a darker blue compare to a lighter stained "newer" collagen.  Does anyone have a reference that they can supply me, as I can't seem to find my paper?
Albert