Kin-furubi on sterling silver

I’ve been experimenting with patinating sterling silver with the furubi 2 solution (copper sulphate and sodium chloride Japanese Special Patinas - Ganoksin Jewelry Making Community). I prepared the silver as set out and immersed the silver in the solution. After c.24 hours it had gone a rather nondescript khaki. I’ve clearly got a lot to learn (not a problem), but experienced guidance would be very much appreciated!