I also painted out the artists watercolours from my own travel tin (mainly W & Newton) and Rowney Artists set and these have not faded so fortunately most of my art output is not affected.
Hence the need to do ones own daylight fading tests. The test strip was in a west facing window from 16th March to 14th April.
I will continue with the tests to see how much each colour fades with time in case any of my set can be salvaged or if it all has to be binned. I used the browns and yellows quite a lot in life drawing.