white toner

I recently purchased two used OKI printers, a 941 and a 942. I am experiencing a strange issue on both machines when replacing the white toner. When the new white toner is added, the brand new Magenta cartridge instantly went from reading 100% to 10%. The same thing happened on BOTH machines...

Is there any such thing as white or metallic silver or gold toner available for any small laser printer? I'm looking for a way to both print gold and silver on invitations and also white on print on balck and solid color textured stocks.