From Wiktionary, the free dictionary
hemlock leather (countable and uncountable, plural hemlock leathers)
- Leather that has been tanned with hemlock.
1877, United States. War Department, Annual Reports of the War Department, volume 1, page 256:The color of slaughter hemlock-leather is better than that from dry hides and it is more pliable than that made from dry or salted hides.
