So I made a cake for my friend's birthday who really likes shoes. I got a chance to use my new Jem shoe cutters. I made the shoes in white gumpaste (Nick Lodge's), figuring it would be easier to airbrush later than mix in all that black coloring now (and still have grey...). I airbrushed (americolor) the shoes black when they were dry, and they looked gorgeous! like black leather. They stayed black all of Sunday, and Monday morning. But as the morning wore on people started to comment that the shoes were turning green!!! They were black when they came in and now they were a dark green! How can I prevent this from happening?

I don't have an answer but here's a bump.

For shiny black leather look, I prefer to use the grey gumpaste, then paint the shoes with powdered black coloring mixed with confectioners glaze. I have a pair of Mary Janes on my shelf from January that still look as fresh as the day I made them.