This Shikiori Ink from Sailor is part of the Sound of Rain Collection, and named for the sound that rain makes as it falls. This icy lilac ink called Potsupotsu is named for the cold pitter-patter of brisk winter rain. The water-based dye ink is smooth flowing can be used with any dip pen or fountain pen with a converter. Made in Japan and packaged in the traditional Sailor square glass 20ml bottle.