September 7, 2023 Amy Shulke Ohuhu Marker, Ohuhu Swatch, Ohuhu Test R13 Clematis: Testing Ohuhu Markers for Lightfastness and Quality September 7, 2023 Amy Shulke Ohuhu Marker, Ohuhu Swatch, Ohuhu Test R13 ClematisLet’s take a closer look at this Ohuhu Marker and its ink characteristics.