TL;DR: A simple experiment to test the lightfastness of fountain-pen inks. This is important for anyone drawing or writing things they’d like to showcase, possibly in a frame, yet still read after many months and years. I put many inks on paper in duplicate, put a copy in a drawer, and taped another on the window. I take snapshots about every weekend and check to see which ink has faded beyond recognition — I know those are not lightfast and when they become less than legible. This mini-report summarizes the first three months of operation.