This is a variety of rusty stuff that I have used on some linen and cotton fabric.
This is 3 days on from when I first wrapped the pristine white linen around the outdoor brazier.
Looks like some ribs to me.
Unwraping the soaking pile of linen and cotton, 2 days on.
Mmmmm, ok I guess. Needs more though, so wrapping it up again.
Into plastic and weighted down with stones to increase the connection with the rust.