add some oxidizer, Hydrogen peroxide, alchohol, Hydrochloric acid, Chlorine.(DO NOT MIX THE HCL and chlorine ) any of the above when added in small increments will cause any KI to turn deep red or purple. If it does then you will have to sublimate it. SWIM has had large returns from hog feeed supplement( looks like salt too )
Most likely you would need a very large amount of salt to get anything back out of it, the percentage is very low.
