Turboshift paints are made with tiny glass-like flakes that work like millions of small prisms within the paint. Depending on how the flakes are made, different colours are refracted or reflected in the light. In layman's terms this means that the paint changes colour depending on what light you are viewing it under, and what angle you are holding it to that light.
Formulated for airbrush use, but may also be hand brushed.