This is a primary colour for streaking and stains. AX-012 1975 Weathered Black has a natural warm almost purple tone to it. It's visible on both the ANH and ESB Falcons and X wings made by ILM and is also seen on Fett and other ships. It has a very distinct liver colour to it when laid on with an airbrush and is easily recognisable on reference photos of the original models. A true Star Wars modelling must have.