pens to write on Fisher slides and cassettes

Hi everyone, does anyone know of a real reliable pen to write labels on 
slides and cassettes prior to processing/staining that won't rub off or smear 
in formalin, alcohol and xylene and wax, etc?  Thanks for  your help in 
advance.  We are  using Pathology Specialist Pen  UPC 308-5-9, from Pacific 
Southwest and they just recently started to smear badly on our slides after 
months of good success with them.  Alice Neumann M.D. Precision Pathology PC 
Arvada, CO

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