Before revision: Tannin uses and market Tannin in a plastic container Tannins have been used since antiquity in the processes of tanning hides for leather, and in helping preserve iron artefacts (as with Japanese iron teapots).
After revision: Tannin uses and market Tannin in a plastic container Tannins have been used since antiquity in the processes of tanning hides for leather, and in helping preserve iron artifacts (as with Japanese iron teapots).