Pelikan 4001 Historical Bottled Ink for Fountain Pens, Royal Blue, 62.5ml, 1 Each (340299)

Eraser, search for “Ink Eradicator”Washable, add some Oxi-Clean.Great shade of blue, easy to read, and being a “dry” ink, it’s friendly to cheap paper since bleeding is minimal. As far as performance, this ink writes well, dries fast, and strongly resists bleeding. It is not waterproof and is definitely not considered a permanent ink (don’t write out your checks with this).Within two weeks of getting this ink, I thought I destroyed a shirt when a poorly capped pen stained my shirt very blue. First time out of the wash the blue was mostly gone; I tossed it back in and added some Oxy-Clean. Second time out of the wash and the blue was completely gone. Even from the seams, the blue ink was gone.Yes, this ink is washable.Super Pirat Ink Eradicator sold by Pelikan will “erase” this ink on paper. In facet most blue inks are designed to be washable which implies they’re also erasable. Blue ink, specifically Royal Blue for Pelikan, was the color ink used in schools to teach kids how to write with a fountain pen. Can’t have kids with permanent ink on their clothes, rugs, desks, etc, so that’s why we have washable blue fountain pen inks for over a century. Blue ink cartridges are also erasable, as are straight “blue” inks from other vendors. Variation on blue, such as blue-black, or dark blue, need not be washable. But if the ink is described as “royal blue” or “blue,” it is most likely washable/erasable. I’ve been collecting FPs for about a year, and this was news to me.For the same ink performance, but without the washability, any other color of the 4001 ink line will work.