I second the etching technique as the best archival of a lot of bad alternatives. However, the unavoidable resulting emulsion breaks, though not much better by bleaching, visible at angles on glossy papers absolutely gives me the shivers on an otherwise "perfect" print. So much so that I have thrown out entire runs of otherwise fine prints to reprint them if the problem was not on the negative itself (i.e., during enlarging). One of a kind, hand made prints ...ahem .