A named craft tool / part lemma (Silver IS More Pliable) drawn from public-domain workshop speech (metals / japan-polish / carriage / pottery / glue / paint / turner / hat / soap / mend).
Silver IS More Pliable is historically related to Iron.
working-metals seats orphan silver-is-more-pliable beside iron as a first craft peer — object speech, not a text-container or tradition dump.