Karl,
I ran across temp. sensitive stickers at Nepcon west.
I've not used these, so I don't know how effective they are.

Celsistrip, Celsi dot and Celsipoint are the product names.
Solder Absorbing Technology Inc. (SAT) is the company.
(413) 788-6191  or 800-628-8862
144 Oakland Street
Springfield, MA 01108

Mitch Austin
[log in to unmask]