I have a spare bottle of Higgins Eternal that I would like to use up. Unfortunately, I find that this ink feathers a lot on many different papers, with the only paper it works on being Rhodia paper. In addition, I find that with some of my dip nibs, the ink does not adhere very well to the nib.
I have read on the Internet, that some people find adding some gum Arabic to the ink helps. I do not have a bottle of gum Arabic, has anybody tried leaving the lid of the bottle off, in order to let some of the water evaporate to thicken the ink, and has it been effective in reducing the feathering problem?