Columbia River thread that keeps its tensile strength Is the synthetic sinew used in leather working, silk, and some of the other plastics, natural fiber, the only one I have seen first hand was hemp, found some along with cloth at my grandma’s as we where cleaning up, she remembers bringing it over when they migrated, she is now 100 + old. It has been in a steamer trunk in basement for 70 years, it’s a bit brittle but still hold once past the outside of the big spool and so was the cloth. Only thing was the faint smell of moth balls when freshly opened.
