Toning Negatives

A lot of photographers are concerned with the archival quality of their prints. Several techniques exist using selenium, sulphides, goldchloride, and sistan to tone and make an achival print. However little is said about the archiving techniques for negatives: prints can remade from an existing negative, but negatives are however unique. So would it be wise to use the print conserving techniques (eg. direct polysulfide toning) to preserve negatives ? Any reflections would be welcome. Thx, Marc.

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