I also bought a full bottle of Pennonia Napnyugta Sunset since I liked the sample. Seems to work well in the Jinhao 20 but probably would be even better in a wider nib.
Its main appeal for me is that it's fluorescent while none of my other legible oranges are (not counting a highlighter ink).
It's a little darker than To-ro, but lighter than Fuyu-gaki.




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