We are also having crystals show up on our PAS stain using the Ventana Benchmark . I was hoping using a new lot of stain would solve the problem but from previous posts I see this did not help. I will be contacting the company tomorrow. Anyone else having this issue? Thanks for your input. Donna Rossi, M.S. Hershey Medical Center of The Pennsylvania State University. _______________________________________________ Histonet mailing list Histonet@lists.utsouthwestern.edu http://lists.utsouthwestern.edu/mailman/listinfo/histonet