I used Kentmere metallic based papers in the 70's and 80's, there was a FB version and later an RC. I had a pack of mixed colours metallic green, blue, red, silver and gold but only used the silver & gold commercially. There was also a range of just plain coloured bases as well.

John Blishen in London sold a range made for Pal by EFKE I think, this and the Kentmere range disappeared many years ago.