J. Herbin Nettoyant Pour Stylo is a clearing solution for fountain pens in a form of standard ink cartridges.
Just place it in a fountain pen that can handle cartridges and let the feed soak and wait 5 minutes. Then clean as usual with cold water!
The solution helps to remove old ink so we can use the fountain pen even longer!
In a handy metal box you can find 6 cartridges.
Made in France