Daler rowney shimmering colours interference medium daler rowney 128 075 710 daler rowney shimmering colours violet produces a beautiful shimmering effect reflecting ambient light and changing with the angle that it is viewed from it is especially effective when applied to a black or dark backgrounddaler rowney shimmering colours interference mediums can be used straight from the tube and produce a magical shimmering metallic transparent lustre with electric intensity daler rowney