Manuel,
I have never seen brass mats. However, I can think of no reason why you could not make a mat out of 2 ply non-buffered, acid free, 100% rag mat board.
I mount my own contemporary dags is passe-partout mounts made of this material.
Of course, making sure you have a good seal is all important
Bob Schramm
Check out my web page at:
http://www.SchrammStudio.com
also look at:
http://www.wlsc.wvnet.edu/www/pubrel/photo.html
>From: Manuel Estébanez
>Reply-To: alt-photo-process-l@sask.usask.ca
>To: alt-photo-process-l@sask.usask.ca
>Subject: To preserve a daguerreotype. Questions
>Date: Thu, 18 Apr 2002 00:24:01 +0200
>
>Where to find, on-line, brass mat to preserver Daguerreotype images? .
>To buy traditional reproduction cases are very expensive. Any alternative presentation techniques?. Any homemade framing and mounting recomendations?. Thanks.
>
>Best Regards,
>Manuel Estebanez
>Spain
>
>PD: I' am actually going to learn the process as well (Becquerel process).