I’ve just read a note from my wife, written using Diamine Monboddo’s Hat. It looked black to me, so we had a discussion and she is still only using Monboddo to ink that pen. Further investigation showed this:
(The contrast has been heavily reduced to show the effect on-camera, but the original is merely a more intense version of this)
Horizontal lines come out as purple-ish, but the vertical ones - and cursive writing - show as totally black. Is this merely an example of extreme shading? The pen is a Jinhao clone (with Arrow clip) of the Parker Sonnet Silver Fougere, with bi-tone coated steel Jinhao F nib.