Hello!

I know this is an age old question, but we are having increasing
difficulties with our cassette markers (the usual permafrost pens).

They have modified their formula, and the pens are worse than ever.

Does anyone have a marking system or knowledge of marking pens that are
solvent and paraffin resistant?  We have tried "Sure Mark" pens, but they
have a broad point and we write many designations and specials on the
cassettes.  The broad point limits the space we have for this.

Thank you for your input.
Donna in Denver
Unipath, LLC