Before splitting, thorns were scraped off with a knife, or by rubbing on a fence post.
Note: the blackberry is best harvested earlier in the season- I found it too woody by mid August.
Crack the inner pith every few inches, then begin peeling the outer skin off to create a nice long strong “vegetable leather strip”
I used the strips as ties to bind an ephemeral sculpture when I did not want “human made” materials going on site.
Strips can be made and used fresh, but if time or season is an issue, rolls can be pre-made, and soaked in water overnight before use.
note: this will change colour from green to brown.