One option is to use DVD media designed for archival use, with a non-oxidizing gold layer, e.g.: https://www.verbatim.com/prod/professional-optical/archival-gra

One option is to use DVD media designed for archival use, with a non-oxidizing gold layer, e.g.: https://www.verbatim.com/prod/professional-optical/archival-grade-gold-dvd-r/ultralife/ https://www.verbatim.com/prod/professional-optical/archival-...