If you like Diamine Ancient Copper, you'll like this one
P.W. Akkerman Dutch Masters #09 Steenrood van Vermeer reminds me of Diamine Ancient Copper albeit slightly more lubricated than an already lubricated-like ink. I see a bit of dark brown, almost black sheen at the edge of where the ink pools in heavily saturated areas, and slight coppery sheen when writing with wet broad nibs. I see some nib and paper combo-dependent shading. It goes down as a very luminous colour, and retains that luminance as it dries. It is similar to Taccia Ukiyo-e Hokusai-Benitsuchi in colour, but the Taccia ink is watery. I can easily obtain a nicely saturated and contained line with Steenrood. Diamine 150t Anniversary Terracotta and Sailor Kobe #39 Renga are less saturated. Sailor Kobe #8 Arima Amber is yellower. Diamine Cult Pens Deep Dark Orange is slightly more orange than Steenrood, but not by much. They are both nicely saturated. I like Steenrood enough to buy a bottle when I’ll finish my 30 ml bottle of Ancient Copper.