Glynn:
I suggest Tempil (brand name) Temperature Indicators.  They are made by:
Big Three Industries
2901 Hamilton Blvd.
South Plainfield, NJ 07080
(908) 757-9273

They make all kinds of inks, labels and markers which do just as you request.


>I have been following the recent thread relating to temperature stickers and
>contacted the supplier of Templaq mentioned by John Crawford. Templaq is
>geared for assembly rework and is not available in a temperature setting to
>suite my requirements. 
>
>My question is this:
>Does anyone know of a temperature-indicating ink which might be screened or
>otherwise applied to boards during manufacture and whose purpose is to
>"ballpark" the highest temperatures seen during assembly, or to indicate
>that the board has exceeded a known temperature during assembly?
>
>
>

-Pat-

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Patrick McGuine
Nicolet Instrument
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(608) 276-6334