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In mountmaking, the safety of the object always comes first and that applies when selecting your mount material as well.  Some materials are already known to be safe and non-reactive, (such as brass, some stainless steels, acrylic plastic, etc.), some are known to be unsafe and shouldn’t be used (wool felt, rubber, etc.) while all other materials should be tested to determine if safe and non-reactive to use.

For more information on materials testing, see the AIC Conservation Materials wiki site and the the MFA Boston's CAMEO Materials Database wiki

A list of mountmaking supply sources is also available to download as a PDF.