50ml Signature Inks

Robert Oster Romeo & Juliet is a special edition fountain pen ink with a new and exciting feature for Robert Oster. Romeo and Juliet is a colo...

Robert Oster Fire and Ice is a bright blue fountain pen ink with a slight green undertone, medium shading, and medium pink sheen. It dries in 30 se...

This Pulp Addiction Exclusive Ink by Robert Oster is a stunning blue/black ink. Like roiling storm clouds this is a dark and subdued blue ink with ...

Robert Oster Thunderstorm is a dark blue black fountain pen ink with medium shading and low brown sheen. It dries in 30 seconds in a medium nib on ...

Robert Oster Taiwan Blue is a deep blue fountain pen ink with a solid teal undertone, medium shading, and medium red sheen. It dries in 40 seconds ...

Robert Oster Grey Seas from the 1980’s collection is a dusky blue grey fountain pen ink with high shading. It dries in 30 seconds in a medium nib o...

Robert Oster Great Southern Ocean is a beautiful, deep indigo-blue fountain pen ink that borders on being blue-black, with medium shading and low r...

Robert Oster Tokyo Blue Denim is a rich denim blue fountain pen ink that sheens copper. It dries in 40 seconds in a medium nib on Rhodia and has an...

Robert Oster Blue Sea is a gorgeous medium blue with medium shading and medium pink sheen. It dries in 20 seconds in a medium nib on Rhodia and has...

Robert Oster Flaming Blue is a classy dark blue fountain pen ink with medium shading and high copper sheen. It dries in 20 seconds in a medium nib ...

Silent Nite fountain pen ink is a slightly dull blue-gray color that is reminiscent of cool winter nights. The ink is soft and attractive, but look...

Robert Oster Lake of Fire is a deep blue fountain pen ink with a slight green undertone, medium shading, and medium pink sheen. It dries in 40 seco...

Robert Oster Sepia Nights is a dark brown fountain pen ink with a slight red undertone, medium shading, and medium pink sheen. It dries in 30 secon...

Robert Oster Blue Black is a dark blue black fountain pen ink with a purple undertone, low shading, and low copper sheen. It dries in 20 seconds in...

Robert Oster Soda Pop Blue is a bright medium blue fountain pen ink with medium shading and medium pink sheen. It dries in 30 seconds in a medium n...

This color is a smokey denim blue, almost a dark teal, that takes on a lot of different colors in its shading. It can even sheen with a bit of rose...

The "clean and clear" Australis Hydra is a beautiful steel blue, representing mythical creatures or Greek islands. But - Australia - probably jelly...

Robert Oster True Blue is a dark blue fountain pen ink with medium shading and medium pink sheen. It dries in 15 seconds in a medium nib on Rhodia ...

Robert Oster Marine is a medium teal-green fountain pen ink with medium shading and medium pink sheen. It dries in 20 seconds in a medium nib on Rh...

Robert Oster Blue Night is a pretty, deep blue with medium shading and medium pink sheen. It dries in 40 seconds in a medium nib on Rhodia and has ...

Robert Oster Torquay is a bright medium turquoise fountain pen ink with medium shading and low pink sheen. It dries in 25 seconds in a medium nib o...

Robert Oster School Blue is a dark blue fountain pen ink with medium shading and medium pink sheen. It dries in 20 seconds in a medium nib on Rhodi...

Robert Oster Midnight Sapphire is a dark blue, almost a blue-black fountain pen ink with medium shading and a pop of pink sheen in large swabs. It ...

Robert Oster Frankly Blue is a medium blue fountain pen ink with a slight green undertone, medium shading, and medium sheen. It dries in 30 second...