Black, Grey & Brown
Back decorations which are airbrushed always carry a truly deep, dark dramatic black, which is often difficult to achieve in sugarcraft items using traditional gel-paste means.
For a grey palette, I have quite a spectrum of grey colours to choose from ranging from the palest pastel grey (called Whisper) to the darkest Graphite shade.
For brown decoratons, II use a deep brown to create 'Dark Chocolate' & a handmixed Walnut shade to create the 'MIlk Chocolate' coloured couterpart.