I've started running my own fading tests now too long ago. Every new ink I use, I add a line to two sheets of paper--one control sheet in stored a closed notebook, and another is taped to a wall opposite two large windows. This location seems perfect for a realistic scenario of having writing in an exposed location but not direct sunlight. Specifically, the windows mostly have white cloth diffusing blinds over them with the exception of about 10" from the top which is exposed glass. There is bright daylight during the day and some sunlight in the afternoon. The wall with the taped paper is a good 16 feet away from the windows, so it gets a bit of everything: small amount of artificial light, daylight shade, and some diffuse sunlight. The paper is Fabriano Bioprima, acid-free with alkaline reserve Control sheet as of July 12, 2019: Scanned exposed sheet on July 12, 2019 Comparison on July 12, 2019: To be continued with more inks and scans over time. Inks listed so far (for the search engine purposes), alphabetically by brand: Colorverse Dark Energy Graf von Faber-Castell Deep Sea Green J. Herbin Lie de The KWZ Walk Over Vistula Lamy Petrol Pilot Iroshizuku Take Sumi Rohrer & Klingner Scabiosa Sailor Ink Studio #573 , #970, #941 Sailor ( Maruzen Athena / Jentle ) Blue Black Sailor ( Maruzen Athena ) Sepia brown Sailor x Nagasawa Kobe #57 Hime Ajisai Stipula Calamo Verde Muschiatto Musk Green Papier Plume Sazerac