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Robert Oster

Explore our collection of Robert Oster Signature Inks – made in Australia and described as well-behaved fountain pen inks. Each ink is produced in a just-in-time manner to meet demand and is bottled in recyclable PET plastic. Robert Oster inks are non-toxic and eco-friendly, crafted with care for both writing performance and environmental impact.

Looking for the full range or more? Browse all bottled fountain pen inks or shop ink samples to try before you commit.

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Robert Oster Signature Ink, Fire and Ice - 50ml bottle, with gold-foil label and a blue swatch featuring a pinkish sheen.

Fire and Ice - 50ml

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$23.00

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Robert Oster Signature Ink, Fire and Ice - 50ml bottle, with gold-foil label and a blue swatch featuring a pinkish sheen.

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Fire and Ice - 50ml

$23.00

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Soda Pop Blue - 2ml sample by Robert Oster, features a deep blue ink swatch on white, with “The Desk Bandit” watermark visible.

Soda Pop Blue - 2ml

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$1.70

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Soda Pop Blue - 2ml sample by Robert Oster, features a deep blue ink swatch on white, with “The Desk Bandit” watermark visible.

Soda Pop Blue - 2ml

$1.70

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Clearwater Rain - 2ml ink, turquoise-blue swatch on white, showcasing Robert Oster's dye-based pigment in a smooth, abstract wash.

Clearwater Rain - 2ml

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$1.70

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Clearwater Rain - 2ml ink, turquoise-blue swatch on white, showcasing Robert Oster's dye-based pigment in a smooth, abstract wash.

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Clearwater Rain - 2ml

$1.70

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Robert Oster Bishop to King - 2ml Ink Sample

Bishop to King - 2ml

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$1.70

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Robert Oster Bishop to King - 2ml Ink Sample

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Bishop to King - 2ml

$1.70

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Dragon's Night - 2ml ink sample showcases a deep blue abstract wash with uneven saturation and a darker outline, reflecting the unique Australian palette.

Dragon's Night - 2ml

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$1.70

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Dragon's Night - 2ml ink sample showcases a deep blue abstract wash with uneven saturation and a darker outline, reflecting the unique Australian palette.

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Dragon's Night - 2ml

$1.70

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Robert Oster Signature Ink bottle, Summer Storm - 50ml, with gold label and dusky purple ink swatch, inspired by South Australia's wine regions.

Summer Storm - 50ml

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$23.00

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Robert Oster Signature Ink bottle, Summer Storm - 50ml, with gold label and dusky purple ink swatch, inspired by South Australia's wine regions.

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Summer Storm - 50ml

$23.00

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Bottle of Robert Oster Signature ink titled Grey Seas - 50ml, features a gold label and deep blue swatch, showcasing its unique Australian-inspired color.

Grey Seas - 50ml

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$23.00

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Bottle of Robert Oster Signature ink titled Grey Seas - 50ml, features a gold label and deep blue swatch, showcasing its unique Australian-inspired color.

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Grey Seas - 50ml

$23.00

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Robert Oster Taiwan Blue - 2ml Ink Sample

Taiwan Blue - 2ml

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$1.70

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Robert Oster Taiwan Blue - 2ml Ink Sample

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Taiwan Blue - 2ml

$1.70

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True Blue - 2ml ink sample by Robert Oster, featuring a deep blue watercolor swatch with a cloud-like texture and reddish-purple edges, reflecting Australian inspiration.

True Blue - 2ml

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$1.70

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True Blue - 2ml ink sample by Robert Oster, featuring a deep blue watercolor swatch with a cloud-like texture and reddish-purple edges, reflecting Australian inspiration.

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True Blue - 2ml

$1.70

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School Blue - 2ml ink sample by Robert Oster, featuring a deep blue abstract ink-blot with darker edges, showcased on a white background from The Desk Bandit.

School Blue - 2ml

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$1.70

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School Blue - 2ml ink sample by Robert Oster, featuring a deep blue abstract ink-blot with darker edges, showcased on a white background from The Desk Bandit.

School Blue - 2ml

$1.70

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Blue watercolor swatch representing Robert Oster's Bass Straight ink sample, 2ml, on white background, showcasing its abstract wash style and dye-based composition.

Bass Straight - 2ml

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$1.70

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Blue watercolor swatch representing Robert Oster's Bass Straight ink sample, 2ml, on white background, showcasing its abstract wash style and dye-based composition.

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Bass Straight - 2ml

$1.70

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Carbon Fire - 2ml ink sample, showcasing a dark blue swatch with subtle shading and a reddish sheen, typical of Robert Oster's dye-based inks.

Carbon Fire - 2ml

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$1.70

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Carbon Fire - 2ml ink sample, showcasing a dark blue swatch with subtle shading and a reddish sheen, typical of Robert Oster's dye-based inks.

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Carbon Fire - 2ml

$1.70

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Robert Oster Signature fountain-pen ink bottle, labeled Thunderstorm - 50ml, featuring a gold label and a circular swatch of muted slate-blue color in the corner.

Thunderstorm - 50ml

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$23.00

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Robert Oster Signature fountain-pen ink bottle, labeled Thunderstorm - 50ml, featuring a gold label and a circular swatch of muted slate-blue color in the corner.

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Thunderstorm - 50ml

$23.00

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Robert Oster Australian Opal Blue - 2ml Ink Sample

Australian Opal Blue - 2ml

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$1.70

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Robert Oster Australian Opal Blue - 2ml Ink Sample

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Australian Opal Blue - 2ml

$1.70

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Robert Oster “Signature” fountain-pen ink in Clearwater Rain, 50ml bottle, with a gold label, shown with a deep teal/blue-green ink swatch.

Clearwater Rain - 50ml

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$23.00

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Robert Oster “Signature” fountain-pen ink in Clearwater Rain, 50ml bottle, with a gold label, shown with a deep teal/blue-green ink swatch.

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Clearwater Rain - 50ml

$23.00

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Robert Oster Signature “Soda Pop Blue” ink, 50ml bottle with gold-foil label, showcases a vibrant blue color in the round inset on the label.

Soda Pop Blue - 50ml

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$23.00

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Robert Oster Signature “Soda Pop Blue” ink, 50ml bottle with gold-foil label, showcases a vibrant blue color in the round inset on the label.

Soda Pop Blue - 50ml

$23.00

More Details →

Tokyo Blue Denim - 2ml ink sample, deep blue with reddish-brown sheen, on paper. Ideal for testing fountain pen ink color and flow.

Tokyo Blue Denim - 2ml

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$1.70

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Tokyo Blue Denim - 2ml ink sample, deep blue with reddish-brown sheen, on paper. Ideal for testing fountain pen ink color and flow.

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Tokyo Blue Denim - 2ml

$1.70

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Dragon's Night - 50ml fountain pen ink bottle with a gold label. Inset shows vivid blue ink with brown-bronze sheen edges.

Dragon's Night - 50ml

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$23.00

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Dragon's Night - 50ml fountain pen ink bottle with a gold label. Inset shows vivid blue ink with brown-bronze sheen edges.

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Dragon's Night - 50ml

$23.00

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Bottle of Robert Oster “Signature” fountain-pen ink, labeled “Deep Sea - 50ml,” with a gold-foil label and blue ink swatch featuring a red/purple sheen.

Deep Sea - 50ml

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$23.00

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Bottle of Robert Oster “Signature” fountain-pen ink, labeled “Deep Sea - 50ml,” with a gold-foil label and blue ink swatch featuring a red/purple sheen.

Deep Sea - 50ml

$23.00

More Details →

Robert Oster “Signature” Morning Mist - 50ml fountain-pen ink bottle with a gold label, displayed with a bright turquoise/teal swatch, dye-based and inspired by South Australia.

Morning Mist - 50ml

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$23.00

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Robert Oster “Signature” Morning Mist - 50ml fountain-pen ink bottle with a gold label, displayed with a bright turquoise/teal swatch, dye-based and inspired by South Australia.

Morning Mist - 50ml

$23.00

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Blue Water Ice - 50ml: Robert Oster “Signature” fountain-pen ink in a sleek black bottle with gold-foil label, featuring a vibrant blue ink swatch.

Blue Water Ice - 50ml

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$23.00

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Blue Water Ice - 50ml: Robert Oster “Signature” fountain-pen ink in a sleek black bottle with gold-foil label, featuring a vibrant blue ink swatch.

Blue Water Ice - 50ml

$23.00

More Details →

GoGo - 50ml Robert Oster Signature ink bottle, vibrant blue with metallic sheen, eco-friendly, crafted in Australia for smooth fountain pen writing.

GoGo - 50ml

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$23.00

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GoGo - 50ml Robert Oster Signature ink bottle, vibrant blue with metallic sheen, eco-friendly, crafted in Australia for smooth fountain pen writing.

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GoGo - 50ml

$23.00

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Robert Oster Bishop to King - 50ml Bottled Ink

Bishop to King - 50ml

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$23.00

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Robert Oster Bishop to King - 50ml Bottled Ink

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Bishop to King - 50ml

$23.00

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Robert Oster “Signature” fountain-pen ink, Great Southern Ocean - 50ml, in a black glass bottle with gold label, ribbed cap, and blue-gray ink swatch.

Great Southern Ocean - 50ml

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$23.00

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Robert Oster “Signature” fountain-pen ink, Great Southern Ocean - 50ml, in a black glass bottle with gold label, ribbed cap, and blue-gray ink swatch.

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Great Southern Ocean - 50ml

$23.00

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Robert Oster Lake of Fire ink, 50ml bottle, features a gold label and deep blue hue with a subtle red sheen, inspired by South Australia.

Lake of Fire - 50ml

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$23.00

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Robert Oster Lake of Fire ink, 50ml bottle, features a gold label and deep blue hue with a subtle red sheen, inspired by South Australia.

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Lake of Fire - 50ml

$23.00

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Robert Oster Bondi Blue fountain-pen ink, 50ml bottle, features a gold-foil label. Includes a vibrant blue ink swatch with darker sheen hints.

Bondi Blue - 50ml

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$23.00

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Robert Oster Bondi Blue fountain-pen ink, 50ml bottle, features a gold-foil label. Includes a vibrant blue ink swatch with darker sheen hints.

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Bondi Blue - 50ml

$23.00

More Details →

Bottle of Robert Oster Signature Ink, Taiwan Blue - 50ml, with a teal swatch displaying a pinky-red sheen, emphasizing vibrant, sustainable, and smooth-writing qualities.

Taiwan Blue - 50ml

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$23.00

X

Bottle of Robert Oster Signature Ink, Taiwan Blue - 50ml, with a teal swatch displaying a pinky-red sheen, emphasizing vibrant, sustainable, and smooth-writing qualities.

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Taiwan Blue - 50ml

$23.00

More Details →

Robert Oster Flaming Blue - 2ml Ink Sample

Flaming Blue - 2ml

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$1.70

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Robert Oster Flaming Blue - 2ml Ink Sample

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Flaming Blue - 2ml

$1.70

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Robert Oster Signature ink bottle, Carbon Fire - 50ml, featuring a dark blue shade swatch in the corner, inspired by South Australian wine regions.

Carbon Fire - 50ml

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$23.00

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Robert Oster Signature ink bottle, Carbon Fire - 50ml, featuring a dark blue shade swatch in the corner, inspired by South Australian wine regions.

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Carbon Fire - 50ml

$23.00

More Details →

Robert Oster Signature fountain pen ink bottle, Australian Sky Blue - 50ml, with a bright blue ink swatch, featuring a gold label.

Australian Sky Blue - 50ml

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$23.00

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Robert Oster Signature fountain pen ink bottle, Australian Sky Blue - 50ml, with a bright blue ink swatch, featuring a gold label.

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Australian Sky Blue - 50ml

$23.00

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Romeo & Juliet - 50ml

Romeo & Juliet - 50ml

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$23.00

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Romeo & Juliet - 50ml

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Romeo & Juliet - 50ml

$23.00

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Bottle of Robert Oster Signature “True Blue” fountain-pen ink, 50ml, with gold-foil label, shown next to a deep blue color swatch with red sheen.

True Blue - 50ml

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$23.00

X

Bottle of Robert Oster Signature “True Blue” fountain-pen ink, 50ml, with gold-foil label, shown next to a deep blue color swatch with red sheen.

/ 1 / 2

True Blue - 50ml

$23.00

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Australis Hydra - 50ml - The Desk Bandit

Australis Hydra - 50ml

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$23.00

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Australis Hydra - 50ml - The Desk Bandit

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Australis Hydra - 50ml

$23.00

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Bottle of Robert Oster Signature fountain-pen ink in Bass Straight - 50ml, featuring a gold label and vibrant blue ink swatch.

Bass Straight - 50ml

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$23.00

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Bottle of Robert Oster Signature fountain-pen ink in Bass Straight - 50ml, featuring a gold label and vibrant blue ink swatch.

/ 1 / 2

Bass Straight - 50ml

$23.00

More Details →

Blue Sea - 50ml

Blue Sea - 50ml

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$23.00

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Blue Sea - 50ml

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Blue Sea - 50ml

$23.00

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Robert Oster Signature Ink bottle, 50ml, labeled Evening Sapphire, with a round swatch displaying its dark blue hue, inspired by South Australia's wine regions.

Evening Sapphire - 50ml

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$23.00

X

Robert Oster Signature Ink bottle, 50ml, labeled Evening Sapphire, with a round swatch displaying its dark blue hue, inspired by South Australia's wine regions.

Evening Sapphire - 50ml

$23.00

More Details →

Bottle of Robert Oster “Signature” Blue Black fountain-pen ink, 50ml, with a deep inky blue swatch showing subtle red-sheen flecks, reflecting Australian inspirations.

Blue Black - 50ml

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$23.00

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Bottle of Robert Oster “Signature” Blue Black fountain-pen ink, 50ml, with a deep inky blue swatch showing subtle red-sheen flecks, reflecting Australian inspirations.

Blue Black - 50ml

$23.00

More Details →

Bottle of Robert Oster “Signature” fountain pen ink, School Blue - 50ml, with a ribbed black cap, gold label, and a deep shimmery blue ink swatch.

School Blue - 50ml

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$23.00

X

Bottle of Robert Oster “Signature” fountain pen ink, School Blue - 50ml, with a ribbed black cap, gold label, and a deep shimmery blue ink swatch.

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School Blue - 50ml

$23.00

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Grey Seas - 2ml ink sample showing a deep indigo wash with soft, irregular edges, highlighting its rich tone and hand-painted texture.

Grey Seas - 2ml

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$1.70

X

Grey Seas - 2ml ink sample showing a deep indigo wash with soft, irregular edges, highlighting its rich tone and hand-painted texture.

/ 1 / 2

Sold Out

Grey Seas - 2ml

$1.70

This product is sold out

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Robert Oster Signature Ink, Tranquility - 50ml bottle, features a gold-foil label and black cap, with a swatch showing its deep teal hue.

Tranquility - 50ml

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$23.00

X

Robert Oster Signature Ink, Tranquility - 50ml bottle, features a gold-foil label and black cap, with a swatch showing its deep teal hue.

/ 1 / 2

Sold Out

Tranquility - 50ml

$23.00

This product is sold out

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