November 13, 2023 Amy Shulke Ohuhu Marker, Ohuhu Swatch, Ohuhu Test Testing Ohuhu: RG030 Red Grey 03 Lightfastness and Quality November 13, 2023 Amy Shulke Ohuhu Marker, Ohuhu Swatch, Ohuhu Test RG030 Red Grey 03Let’s take a closer look at this Ohuhu Marker and its ink characteristics.