I found this egg shell on a walk in some local woods. It was caught in a patch of light which made it stand out from the surrounding browns, greens and greys. The outside of the shell turned out to be almost exactly the hue of phthalo blue except for a slight green cast from the light coming through the foliage. This gave me a chance to try some acrylic glazing medium mixed with flow improver. After spreading the clear medium over part of the shell, a small amount of dilute grey green paint could be dropped in then spread and blended with a large clean damp brush.

A blackbird’s egg perhaps, or a song thrush. I’ve no idea if the contents escaped or were eaten.