According to the description: Halo-Chrome is Rockland’s unique toner that transforms black and white prints into pure metallic silver by fusing together the colloidal silver grains that make a black and white print into gleaming solid silver. Halo-Chrome toner can be used with all RC and fiber-base papers. On glossy papers, it gives a mirror-finish, and on matte papers a brushed-silver finish.
There are 2 parts. First you bleach the print, then mix the toner with the activator. The activator is ammonia. You cannot use sudsy ammonia, must be at least 10%, janitorial straight. The only place I was able to find it was Ace hardware.
YOU MUST WEAR GOGGLES. I made this mistake, I had a mask, but did not protect my eyes, and had a nice haze indoors for several hours. You can read more in depth about the process at alternative photography.
Images photography at Nicole Caldwell Studio on the 4×5 camera sinar p2.