Gum arabic is used in ink as a binder and thickener, enhancing viscosity for calligraphy by preventing feathering/bleeding on paper and improving ink flow. It adds glossy, vivid, and controlled strokes, often used to turn watery fountain pen inks into better-performing dip pen inks, typically added at a 4:1 ratio.
Other sources put this as “up to 7:1 ratio, I say it depends on the ink, and your preferences.
15 grams, in a wide mouth glass tub.
