Stewart, i have used stone and white coloured scuff master to re-colour black, you might need two coats but it is an opaque Acrylic paint. Gliptone call it a dye, i think thats a marketing term, i think a 'dye' soakes into the leather, Scuffmaster is a surface paint. I have used it (and other high grade acrylics) to paint on flying jackets in the past so i know it works, the jackets are still good after 15 years.
