Robert Oster Signature Ink - Ink Bottles (92 colors)

Author: Feliks

Review Title: Fire&Ice. Hands down best blue.

• Review Add on: 04-10-2026
• Average Rating: (5)

Despite the name, it's not a heavy sheener, and in a good way. It's well behaved and the shade of blue (leaning towards teal) is unique and so gratifying to look at. F&I deserves every part of compliment it is getting from the community. RO knows their blue inks. Also more manufacturers need to put color/name labels on the cap like RO do so you can tell what it is from above when it's in a drawer with a dozen other inks.

Author: Dominique Vermeulen

Review Title: Geweldige inkt wouw

• Review Add on: 30-09-2026
• Average Rating: (5)

Naast Diamine heb ik nu nog een top inkt ontdekt en dat is Robert Oster. Naast de geweldige intense kleuren schrijft hij soepel en zacht vind ik de potjes erg charmant kortom een nieuwe topper om te gebruiken in mijn Esterbrook fountain pennen. Love it.

Author: Anna

Review Title: My favourite ink brand

• Review Add on: 24-04-2026
• Average Rating: (4)

I've never been disappointed with Robert Oster's ink. The colours are beautiful, they don't fade over time. Whenever I look for a specific shade, I first check Robert Oster and usually I find exactly what I need. Most of the colours I own are rather on the wet side but not too wet, so writing is a pleasure. My favourite colour is definitely Evening Sapphire. It dethroned Shin-Kai as my favourite dark blue ink.
Recently I've read that this ink is slightly alkaline, so I don't use it in vintage pens with rubber sacs but it's just a precaution, I don't think it would really do any harm.

Author: CICEK ISIKSEL SONMEZ

Review Title: high quality

• Review Add on: 23-03-2026
• Average Rating: (5)

Robert Oster has become one of my favorite ink brands. Their inks work well with every pen. I own Jade and Caffe Crema from this brand, and I’m looking forward to buying more. Appelboom is also a trusted website where you can buy Robert Oster inks.

Author: LUCE

• Review Add on: 01-02-2026
• Average Rating: (4)

One of my favorite inks! The color is soft and subtle and the ink is well balanced

Author: RSM

Review Title: Fantastic colour

• Review Add on: 22-08-2025
• Average Rating: (5)

Velvet Crush is a butiful purple. As usual Robert inks bahave in a very good way in any fountain pen. I really like this Brand and colour.

Author: Sara

Review Title: Most behaved inks

• Review Add on: 21-05-2025
• Average Rating: (5)

These inks are really great and write so well with any pen brand and nib size. The variety is also great and is my new favourite ink brand.

Author: S.S.

Review Title: R.O. Honey Bee

• Review Add on: 01-05-2025
• Average Rating: (5)

A very nice and pleasant ink for anyone searching for a rich yellow with great shading leaning into a deeper orange and brown.
As always, Robert Oster inks are well behaved and are suitable for all kinds of nibs and filling systems with little maintenance even after drying out.

Author: Birgit Walter

Review Title: Robert Oster Caffe Crema

• Review Add on: 19-03-2025
• Average Rating: (5)

This ink is a perfect match for my TWSBI Eco Caffe and Espresso. It is a nice and saturated brown tone. It provides a constant ink flow and a smooth writing experience.

Author: Patrick

Review Title: Ice with a hint of Fire

• Review Add on: 05-01-2025
• Average Rating: (5)

This is a very nice and well behaving ink but the fire part, that red sheen, is very subtle. For some that can be a negative, for me it is a positive because it occurs only occasionally it is more special and the more I enjoy it while using it.

Author: Lenie

Review Title: Robert Oster Cafe Crema

• Review Add on: 10-11-2024
• Average Rating: (5)

I am so happy I puchased this ink. I love coffee + brown inks so this is a perfect combo. Ink is not dry. It compliments my Leonardo Furore Ginger fountain pen so much. Love it!

Author: Niraj

Review Title: Beatiful Blue but dry

• Review Add on: 09-06-2023
• Average Rating: (4)

Hi,

I have been wanting this color for awhile. Finally pulled the trigger. I do enjoy it when laid on heavy which gives it a wonderful red sheen. I would avoid this on any nib below Medium. I don' t think you would get the same experience. I was using the Galen Leather Everyday Notebook with the original Tomoe River paper.

Author: Jean-Pierre Schepens

Review Title: Robert Oster Blue Water Ice

• Review Add on: 03-05-2023
• Average Rating: (5)

My blue of blues.
Although I've got quite a large collection of blue inks, this one is my favourite.
An awesome cerulean blue with great shading properties and very well behaved on top. A must-add to any ink collection as far as I'm concerned. :-)

Author: Konstantin Ratushnyak

• Review Add on: 26-01-2023
• Average Rating: (4)

Excellent quality ink! The colors are exactly as shown in the preview. I will definitely buy more.

Review Title: Lovely

• Review Add on: 08-08-2022
• Average Rating: (5)

Love the colour! It's the exact shade I was looking for. The packaging is sturdy, and because it's not a glass bottle it's very light.

Author: Rebecca Lapiner

Review Title: I like the Oster inks

• Review Add on: 21-02-2022
• Average Rating: (5)

I like the Robert Oster inks.
They flow well and the colors are unique.

Author: Barry

Review Title: Perfect for me

• Review Add on: 21-11-2021
• Average Rating: (5)

I was looking for a very dark green ink for a long time one that was dark enough that it wouldn't look out of place in a business setting and bright enough that it was not just black with a name reminiscent of some other colour that may have been added in small amounts.

Enter RO "Green at Night" it is exactly the colour I have been looking for a green to petrol blue that goes down noce and dark but when you see it it makes you question the colour. Perfect.

The ink flows well and I would consider it to be a thin "watery" ink. This is not a bad thing at all. Even in one of my high flowing Italian pens this works a treat.

The water resistance is not good and if you are writing something that has a possibility of getting wet it will not hold up - not that many fountain pen inks will so not to dissimilar to most - other than that it is a near perfect ink and I will be adding several more to my collection as well as stocking up on my new signature colour.

Author: Helmar Franke

Review Title: Rober Oster Blue Sea

• Review Add on: 25-03-2020
• Average Rating: (4)

Niet mijn eerste RO inkt en ook zeker niet mijn laatste. Zelfs voor mij als linkshandige een fijne inkt met een prachtige tint blauw.
De fles is stevig.

Een pen die gevuld was met deze inkt laat zich eenvoudig reinigen.

Author: Crescencio

Review Title: RO: Velvet Crush

• Review Add on: 22-12-2019
• Average Rating: (5)

RO: Velvet Crush

I bought this ink thinking it would be a good mimic to Lamy's Dark Lilac. While close, not close enough in my opinion. You need good paper (rhodia, tomoe river, etc) to get this color. At the same time, it may get closer to that effect if it reduces/evaporates. Since this is a purple color, it may have flow issues for some people. You can solve this by adding a drop of dawn/liquid dish soap.

Author: Crescencio Altamirano

Review Title: RO Grey Seas

• Review Add on: 22-12-2019
• Average Rating: (5)

RO Grey Seas: This ink is a light Greyish Blue color. This ink in my experience does represent itself better in broader nibs as most do, or at least those with better flow back (too much and you get away from the Greyish Blue color). I have not had any flow issues with his ink yet. The photos you can find online for this ink are a pretty good

Author: KyungWon Lee

Review Title: Good ink

• Review Add on: 25-05-2019
• Average Rating: (4)

I bought the ink green green. The color is same as monitor. It is smooth and well writing.

Author: Barbara

Review Title: New favorite ink

• Review Add on: 28-04-2018
• Average Rating: (5)

I was so excited when I saw that Appelboom carries the Robert Oster inks. Gold Antiqua is a phenomenal color, the variation and saturation are amazing! Won't remain the only color in my collection for sure!

Author: Suzanne

Review Title: Prachtige en gebruiksvriendelijke inkt

• Review Add on: 23-04-2018
• Average Rating: (5)

Ik heb verschillende inkten van Robert Oster geprobeerd, en Tranquility is mijn grote favoriet! De kleur is helder groen(blauw), met meer groen dan blauw. Het kleurverloop van de inkt en de helderrode "sheen" geven veel diepte. Echt een inkt om blij van te worden!