I had promised in December of last year to toss these in a south-facing window to see how lightfast the colors were. The left-side was out in the sun and the right side was protected. They actually did much better than I expected. They were exposed for a little over 11 months.
The disappearing orange was rather extreme, but I’m always fascinated by color that seem to unmix themselves. You can see this a bit in the greens above. The yellows slightly faded. With other paints I’ve seen better examples of this where some really good looking violets completely unmixed to blue.