TWSBI Diamond 50 Ink Bottle - Black TWSBI Rose Gold The Innova Formula M collection

The Innova Formula M collection offers three color options: PVD black

China Blue Bottled Ink by Diamine is non-toxic water-based fountain pen ink that can be used with any fountain pen and will not clog your pen

“Light sea green

This celebratory design is perfect for kids

TWSBI Diamond 50 Ink Bottle - Black TWSBI Rose Gold The Innova Formula M collectionThe TWSBI Diamond Black 50mL Ink Bottle is a glass bottle with anodized aluminum top that is the perfect accessory for any fountain pen addict! The bottle allows for easy refilling of your fountain pen by offering an upper reservoir that fills with ink when you turn the bottle upside down (cap on of course!) The reservoir provides a set amount of ink to fill your pen and avoids the hassle of dipping your pen to the bottom of the bottle, trying to get