Gummiberry sounds so awesome! Enjoy this amazing iron gall fountain pen ink from KWZ Ink. The IG Gummiberry has a beautiful purple colour that has highly saturated tones and dries quickly when you put pen to paper. IG Gummiberry is also a waterproof ink. While modern iron gall inks are tamer than their predecessors of years gone by, we recommend that you only use this ink in a pen that is regularly and properly maintained.
Please note that leaving an iron gall ink in an unused pen that is not maintained for a very long period of time could cause corrosion to occur in pens with stainless steel nibs.