The most important thing in making archival CD backups is the dye, not the reflective layer. Both gold and silver are used in the reflective layer, and both are considered to be pretty much equivalent in terms of aging.
The best dyes to use are phthalocyanine and metal stabilized cyanine. It's difficult to visually tell if a disc has metal stabilized cyanine as it is the same pale color as normal cyanine, which is the worst dye for longevity. Phthalocyanine is a darker dye and easy to tell from cyanine. If you want good archival CD's, then ensure that you are getting a good dye. Manufacturers will sometimes change dyes even in what they label as an archival CD in order to cut costs.
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