I’ve discovered an interesting way to create barbed wire without the tetanus!
You’ll need 3 lengths of wire of roughly the same length to coat with clay: one somewhat stiff craft wire (stiff enough to hold its shape), and two nylon-coated stainless steel beading wires. You’ll want to use longer pieces than you think you’ll need because they end up twisted together. Mix some acrylic paint into a ball of lumina polymer clay to create a lovely shade of muddy dark brown.
