The Best Waterproof Fountain Pen Inks | JetPensI recently revived use of my Lamy Safari, telling myself I’d go for 30 days before making any decisions on transitioning to it for my ‘everyday’ pen. (The current everyday pen being a Pentel Energel 7mm rollerball.)Nearing the end of my T10 Lamy Blue refill cartridges, and finding myself wanting to continue use further, I dug a little deeper before committing to a replacement ink. I had noticed the Blue would react adversely to water, and upon researching confirmed that it, like many standard fountain pen inks, are water soluble and will smudge and potentially even be rendered unreadable in enough water (making me particular nervous for some business correspondence I had addressed by hand recently). Some inks are considered various degrees of water resistant, and a few are specifically waterproof (though as you might suspect, the ink properties differ).In the end I settled on Lamy Blue-Black in T52 ink well which is water resistant and should adequately fill my needs.Thank you to the author of the above post for a great breakdown and analysis of inks.