The Heavy Body line contains the largest assortment of unique pigments available to the professional artist, including a range of pigments previously unavailable in acrylic paints. All Golden Heavy Body paints contain pure pigments in a 100% acrylic emulsion vehicle. No fillers, extenders, or pacifiers are used. No toners or dyes are included. No adulterants of any kind are added. Line Extensions include both iridescent and interference colors. Interference colors reflect their own colors in intense direct light and transmit a complement in indirect light. This "flip" varies according to the surface and the surface color. Adding a small amount of black will produce brighter colors. Interference colors reflect their own light. They appear differently dependent on the light source being either direct or indrect. Mix these colors into other Golden colors to produce the greatest array of pearlescent colors imaginable. Experiment for unique and fascinating effects.