I cut a 5 cm strip of each of the Diamine writing samples from the previous post and left them in the window for three days. This is not Amberlea's massive fade test: I simply left the sheets in the window for three days. The window faces due west, not south. In England. In August. They may have gotten nine hours of direct sunlight. This is not meant to be a stress test; this is forgetting your notebook in the office window over the weekend. The sort of thing you might do. Below are the samples on Rhodia paper with the 5 cm strip pasted in with a blue border. Clearly, if you think this is a realistic test and it applies to you, then there are a dozen or so inks that are going to be problematic, including Amazing Amethyst (sort of survives)Imperial BlueMajestic Purple (still readable, but not purple)Lavender (colour change)Imperial PurpleHope Pink (almost completely gone!)Cerise (ditto!)Flamingo PinkPink (gone)Pumpkin (still readable, but different colour)CoralOchre (survives)Orange (almost gone)Peach Haze (gone)The results on the cartridge paper are at first glance similar and I will try to prepare the files later. I hope this is useful. Comments and suggestions are most welcome.