50ml Signature Inks

Robert Oster Direct Sun is a brash fiery red fountain pen ink with medium shading. It dries in 30 seconds in a medium nib on Rhodia and has an aver...

'Fresh and Sweet' Australis Rose is a deep pink color of a refreshing light wine. Made in one of Australia's wine regions. Robert Oster Inks An i...

Robert Oster Melon Tea is a dark, cool-toned brown fountain pen ink with medium shading and low bronze sheen. It dries in 35 seconds in a medium ni...

Robert Oster Honey Bee from the 1980’s collection is a dusky mustard yellow fountain pen ink with medium shading. It dries in 30 seconds in a mediu...

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 Black Violet is a dark purple-black fountain pen ink with low shading and a pop of red sheen in large swabs. It dries in 30 seconds in...

Robert Oster Green at Night is a great dark green fountain pen ink with medium shading and medium red sheen. It dries in 30 seconds in a medium nib...

Robert Oster Signature Ink Kelp Forest (The 2025 Melbourne Pen Show Exclusive) is a stunning chromoshading ink that shifts between cool green and d...

Robert Oster Moss is a dark mossy green fountain pen ink with medium shading. It dries in 25 seconds in a medium nib on Rhodia and has an average f...

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 Citrus is a vibrant, bright green fountain pen ink with medium shading. It dries in 30 seconds in a medium nib on Rhodia and has an av...

Robert Oster Blood Crimson, is a medium muted red fountain pen ink with medium shading. It dries in 20 seconds in a medium nib on Rhodia and has a ...

Robert Oster Deep Purple is a dark, saturated purple fountain pen ink with low shading and a pop of brown sheen in large swabs. It dries in 15 seco...

Choc Pudding fountain pen ink is a cool-tone unsaturated brown. The color of chocolate pudding or hot chocolate powder! Robert Oster's Choc Pudding...

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 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 ...

Robert Oster Bondi Blue is a summer, medium turquoise blue fountain pen ink with medium shading and medium pink sheen. It dries in 30 seconds in a ...

Robert Oster Fire Engine Red is a vibrant medium red fountain pen ink with medium shading. It dries in 30 seconds in a medium nib on Rhodia and ha...

Robert Oster Deep Sea is a gorgeous dark teal fountain pen ink with medium shading and medium pink sheen. It dries in 30 seconds in a medium nib on...

Robert Oster Burned Orange is an interesting, dark orange fountain pen ink with medium shading and a little bit of black sheen in large swabs only....

Robert Oster Bishop to King is a vibrant, blue-purple fountain pen ink with medium shading and a pop of bronze sheen in large swabs. It dries in 20...

Robert Oster Red Candy is a medium red fountain pen ink with medium shading and medium brown sheen. It dries in 30 seconds in a medium nib on Rhodi...

Robert Oster Toffee is a medium, warm toffee brown fountain pen ink with medium shading. It dries in 50 seconds in a medium nib on Rhodia and has a...

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...