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TWSBI Blue-Black ink is suitable for fountain pens and contains iron particles, which make it permanent and waterproof. It flows smoothly on paper and comes in a glass bottle with an internal plastic insert, allowing you to draw out every last drop of ink.
The aluminium caps from Diamond 50 bottles can be fitted onto the bottle cap.
Specifications are collected from official manufacturer websites. Please verify the specifications before proceeding with your final purchase. If you notice any problem you can report it here.