Erie sales rep, just last week, stated their Polysine aka poly l lysine
slides had no expiration date, and we love them.  One of the few coated
slides that retains PAP pen marks after acetone fixation! We have used
samples from some old lots without problems. 

Our PLP prefixed lung frozen sections stay on even after some rough
handling.  
Gayle Callis
MT,HT,HTL(ASCP)
Research Histopathology Supervisor
Veterinary Molecular Biology - Marsh Lab
Montana State University - Bozeman
S. 19th and Lincoln St
Bozeman MT 59717-3610

406 994-6367 (lab with voice mail)
406 994-4303 (FAX)

email: gcallis@montana.edu