This was the only case that I ever had where this type of color was after an ion detox.
I had a retired 65 year old welder who had been in the welding trade for over 45 years. He had breathed in carbon toxins over all of those years. When I administered his ion detox, the scum and large bubbles on top of the water were light colored black with shiny black specks on top of the bubbles. (Release of heavy metals)