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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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Gold Antiqua - 50ml bottle of Robert Oster Signature fountain-pen ink, featuring a rich, warm brown swatch highlighting its unique shading inspired by South Australia.

Gold Antiqua - 50ml

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$23.00

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Gold Antiqua - 50ml bottle of Robert Oster Signature fountain-pen ink, featuring a rich, warm brown swatch highlighting its unique shading inspired by South Australia.

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Gold Antiqua - 50ml

$23.00

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Abstract wash of bright red-orange watercolor on white background, highlighting Robert Oster's Orange - 2ml ink sample, with faint THE DESK BANDIT watermark at the bottom.

Orange - 2ml

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$1.70

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Abstract wash of bright red-orange watercolor on white background, highlighting Robert Oster's Orange - 2ml ink sample, with faint THE DESK BANDIT watermark at the bottom.

Orange - 2ml

$1.70

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Midnight Sapphire - 2ml ink sample featuring a dark blue–purple, granulating swatch on a white background, branded faintly with THE DESK BANDIT.

Midnight Sapphire - 2ml

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$1.70

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Midnight Sapphire - 2ml ink sample featuring a dark blue–purple, granulating swatch on a white background, branded faintly with THE DESK BANDIT.

Midnight Sapphire - 2ml

$1.70

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Wind - 2ml

Wind - 2ml

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$1.70

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Wind - 2ml

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Wind - 2ml

$1.70

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Pink Squirrel - 2ml

Pink Squirrel - 2ml

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$1.70

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Pink Squirrel - 2ml

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Pink Squirrel - 2ml

$1.70

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Muddy Swamp - 2ml

Muddy Swamp - 2ml

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$1.70

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Muddy Swamp - 2ml

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Muddy Swamp - 2ml

$1.70

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Chicago - 2ml

Chicago - 2ml

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$1.70

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Chicago - 2ml

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Chicago - 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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Vine Leaf - 2ml sample: Abstract green watercolor swatch represents the vibrant Robert Oster ink, showcasing subtle tonal variations for fountain pen enthusiasts.

Vine Leaf - 2ml

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$1.70

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Vine Leaf - 2ml sample: Abstract green watercolor swatch represents the vibrant Robert Oster ink, showcasing subtle tonal variations for fountain pen enthusiasts.

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Vine Leaf - 2ml

$1.70

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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 Ink Velvet Crush (50ml) in a black vial with a gold label, showcasing rich purple ink with a gold-bronze sheen.

Velvet Crush (50ml)

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$23.00

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Robert Oster Signature Ink Velvet Crush (50ml) in a black vial with a gold label, showcasing rich purple ink with a gold-bronze sheen.

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Velvet Crush (50ml)

$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.

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 Cherry Blossom - 50ml fountain pen ink in a sleek black bottle, featuring a gold-foil label and a circular swatch of dusty magenta/purple shade.

Cherry Blossom - 50ml

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$23.00

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Robert Oster Cherry Blossom - 50ml fountain pen ink in a sleek black bottle, featuring a gold-foil label and a circular swatch of dusty magenta/purple shade.

Cherry Blossom - 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

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Abstract design preview for Robert Oster's Green At Night - 2ml ink sample, featuring an irregular dark form with lighter patches on a white background.

Green At Night - 2ml

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$1.70

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Abstract design preview for Robert Oster's Green At Night - 2ml ink sample, featuring an irregular dark form with lighter patches on a white background.

Green At Night - 2ml

$1.70

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Whiskey - 2ml

Whiskey - 2ml

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$1.70

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Whiskey - 2ml

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Whiskey - 2ml

$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.

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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River of Fire - 50ml bottle of Robert Oster Signature fountain-pen ink with a circular swatch displaying its deep teal hue and reddish sheen.

River of Fire - 50ml

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$23.00

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River of Fire - 50ml bottle of Robert Oster Signature fountain-pen ink with a circular swatch displaying its deep teal hue and reddish sheen.

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River of Fire - 50ml

$23.00

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Pinky - 2ml

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$1.70

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Pinky - 2ml

$1.70

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2ml sample of Robert Oster's Lemon Grass ink, featuring a dark olive-green swatch with textured, irregular edges on a white background, watermarked The Desk Bandit.

Lemon Grass - 2ml

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$1.70

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2ml sample of Robert Oster's Lemon Grass ink, featuring a dark olive-green swatch with textured, irregular edges on a white background, watermarked The Desk Bandit.

Lemon Grass - 2ml

$1.70

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Mystic Storm - 2ml

Mystic Storm - 2ml

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$1.70

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Mystic Storm - 2ml

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Mystic Storm - 2ml

$1.70

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Robert Oster Australis Rose - 50ml Bottled Ink

Australis Rose - 50ml

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$23.00

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Robert Oster Australis Rose - 50ml Bottled Ink

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Australis Rose - 50ml

$23.00

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Robert Oster Signature Toffee ink, 50ml bottle with black ribbed cap and gold label, showcases a warm coppery-brown hue, inspired by South Australia's palette.

Toffee - 50ml

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$23.00

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Robert Oster Signature Toffee ink, 50ml bottle with black ribbed cap and gold label, showcases a warm coppery-brown hue, inspired by South Australia's palette.

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Toffee - 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

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Lipstick Red - 2ml

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$1.70

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Lipstick Red - 2ml

$1.70

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Blue Sea - 2ml ink sample by Robert Oster, showing deep blue with reddish-purple sheen on white paper, featuring The Desk Bandit watermark.

Blue Sea - 2ml

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$1.70

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Blue Sea - 2ml ink sample by Robert Oster, showing deep blue with reddish-purple sheen on white paper, featuring The Desk Bandit watermark.

Blue Sea - 2ml

$1.70

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Blue Lagoon - 2ml ink sample, featuring an abstract blot of bright blue with darker purplish gradients, showcasing Robert Oster's dye-based ink. Watermark: THE DESK BANDIT.

Blue Lagoon - 2ml

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$1.70

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Blue Lagoon - 2ml ink sample, featuring an abstract blot of bright blue with darker purplish gradients, showcasing Robert Oster's dye-based ink. Watermark: THE DESK BANDIT.

Blue Lagoon - 2ml

$1.70

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Muddy Sand - 2ml

Muddy Sand - 2ml

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$1.70

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Muddy Sand - 2ml

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Muddy Sand - 2ml

$1.70

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Robert Oster Signature Velvet Storm ink, 50ml bottle with gold label, displayed with a teal-blue ink swatch featuring a red sheen.

Velvet Storm - 50ml

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$23.00

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Robert Oster Signature Velvet Storm ink, 50ml bottle with gold label, displayed with a teal-blue ink swatch featuring a red sheen.

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Velvet Storm - 50ml

$23.00

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Marrone Mustard - 2ml ink sample, dark brown blot on white, featuring The Desk Bandit watermark, representing Robert Oster's dye-based ink.

Marrone Mustard - 2ml

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$1.70

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Marrone Mustard - 2ml ink sample, dark brown blot on white, featuring The Desk Bandit watermark, representing Robert Oster's dye-based ink.

Marrone Mustard - 2ml

$1.70

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Detox - 2ml

Detox - 2ml

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$1.70

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Detox - 2ml

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Detox - 2ml

$1.70

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Ten Dollar Teal - 2ml

Ten Dollar Teal - 2ml

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$1.70

X

Ten Dollar Teal - 2ml

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Ten Dollar Teal - 2ml

$1.70

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Muddy Crown - 2ml

Muddy Crown - 2ml

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$1.70

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Muddy Crown - 2ml

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Muddy Crown - 2ml

$1.70

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Robert Oster Signature Honey Bee fountain-pen ink, 50ml bottle, shown with a metallic gold swatch, inspired by South Australia's vibrant palette.

Honey Bee - 50ml

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$23.00

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Robert Oster Signature Honey Bee fountain-pen ink, 50ml bottle, shown with a metallic gold swatch, inspired by South Australia's vibrant palette.

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Honey Bee - 50ml

$23.00

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NG Special '16 - 50ml, Robert Oster Signature fountain-pen ink in an elegant black glass bottle with a gold seal, featuring orange-toned ink.

NG Special '16 - 50ml

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$23.00

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NG Special '16 - 50ml, Robert Oster Signature fountain-pen ink in an elegant black glass bottle with a gold seal, featuring orange-toned ink.

NG Special '16 - 50ml

$23.00

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Robert Oster Cosmic Swirl - 50ml Bottled Ink

Cosmic Swirl - 50ml

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$23.00

X

Robert Oster Cosmic Swirl - 50ml Bottled Ink

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Sold Out

Cosmic Swirl - 50ml

$23.00

This product is sold out

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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.

/ 1 / 2

Sold Out

Dragon's Night - 50ml

$23.00

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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