For this one, I prepared 1.5m of knitted chord and used this "knarr" knotting tutorial. Once knitted, I dip dyed the back of the necklace using Rit powder dye in Pearl Grey. I then made black beads using polymer clay to fix the ends.
It seems I was a little off with the water to dye ratio because it turned out almost black. A happy accident though, since I'm a touch obsessed with black and white.