Thanks to all responders.
Anne, I think you hit the bullseye with Clearsnap. They show something on their web site called "Ancient Age" archival ink. It will probably do the trick. Many colors. Largest stamp pad size is 2" and change by 3" and change. That should be about right.
Embossing, at least when using the products Clearsnap offers, seem to need 300 degree heat as part of the drying and/or curing process. I think I'll stay Clear from that until I understand the various embossing methods a bit more.
Thanks again, folks.
Best regards,
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