This frosted glass bottle contains 70ml of TWSBI Sapphire Blue fountain pen ink, and comes with a conical insert for easy pen filling.
The top of the TWSBI Diamond 50 Inkwell is also interchangeable with the top of these 70ml ink bottles, for another easy way to fill compatible pens.
Type: Bottled Ink
Bottle Material: Glass
Bottle Opening Diameter: 20.2mm (0.80in)
Fast Drying: No
Freeze Resistant: No
Iron Gall: No
Water Resistant: No
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