Back in June 2010 I purchased some new inks and water soluble crayons. I posted a color test, where examples of all the new materials were placed on a sheet of paper, the paper cut in half – one half left in the sun, one half placed in a drawer. Well that was over a year ago now, so it’s time to look at the results. (The top half in both these tests was not exposed to the light)
The Caran d’Ache Neocolor Crayons were surprisingly reliable considering the harshness of the test (12 months exposure in full sun)
The pink and mauve colors (marked with a O) fared the worst followed by a couple of the warm blues. No painting should ever be exposed to this amount of sunlight, so I’m happy to use all but the two worst colors.
The Winsor and Newton Calligraphy Ink was exposed to full sun for 12 months and there is no detectable color shift or fading, so these colors can be used with confidence.
Make it a habit to use this test on any new paints, pencils, inks pastels etc. It could save a lot of embarrassment if someone buys one of your works, only to find the colors fade of change over a period of time.