Hello. I have tried to make verhoeff's stain to use for optical strain
measurements on human knee ligaments, but I can not seem to get it to
stain correctly. (Instead of a dark stain, it is a pale green). It may
be that the mixture calls for Iron Chloride II, and the FeCL2 that
I have is oxidized and consequently makes a solution that contains a rusty
colored precipitate.

If anyone has made this stain and has suggestions as to what I may be
doing incorrectly, please contact me. Also if anyone knows of a good,
relatively recent reference that contains directions to make this stain,
please let me know.

Thank you very much for your time.

Virginia Ferguson
Department of Mechanical Engineering
University of Colorado at Boulder