Is there any Ink that is fountain pen compatible and does go transparent (permanently) when heated up? I've seen this crowd funding campaign: https://igg.me/at/rocketbook/x/13511842 Basically this is a notepad which comes with a smartphone app then and it is reusable by heating it in a microwave, works with the pilot frixion pens because they fade away with heat. I think the idea is really great but I wouldn't really like to use a ballpoint frixion pen to use the notepad, I'd rarther use my fountain pen... so any hints? Should be around 60°C that it goes transparent, which is the temperature when the frixion ones do turn transparent and to which the notepad is designed. Otherwise I'm probably going to buy one and then print own pages, they do provide the templates anyway.