on saleRobert Oster River of Fire - 50ml Bottled Ink

Product Code RO-50297

In Stock

out of stock

on saleRobert Oster River of Fire - 50ml Bottled Ink

Product Code RO-50297

In Stock

out of stock

50ml Bottle

50ml plastic bottle of Robert Oster Signature fountain pen ink in the color River of Fire.

Robert Oster Signature Inks are handmade in Australia. The recyclable PET bottles are manufactured in Australia's first carbon neutral plastics plant.

Note: Robert Oster is in the process of changing the labels on their bottle and the label on the bottle you receive may vary from what is pictured here.

A message from Robert Oster:

My great interest in fountain pen inks – and by extension inks that combine many creative applications – began with the birth of my love of fountain pens in 1989.

As Robert Oster Signature Inks are quite recent to the market, think of the interim between 1989 and today, as the fertile ground into which my present love of all things ink was seeded and grown.

The contents and packaging of my Inks are all nature friendly and the colours a genuine inventory of the Australian palette.

Robert Oster Signature originates from one of the most famous wine producing regions of the world, the Coonawarra district of South Australia, an idyllic setting with great influence on the senses. There is my inspiration. It’s a joy to share it with you.

Robert Oster
Bottled Ink
Bottle Material
Bottle Opening Diameter
17.4mm (0.69in)
Fast Drying

Whether or not the ink contains glittery particles.

Freeze Resistant

Whether or not an ink is specially formulated to better withstand freezing temperatures.

Iron Gall

Ink made from iron salts and tannic acids. Though quite permanent and waterproof, these inks are typically known for causing chemical corrosion to metal pen parts (especially the nib) and should be used sparingly or with less-valuable pens.


Whether or not an ink is specially formulated to increase flow in your pen.


Whether or not the ink contains finely-ground solid particles in liquid suspension.

Water Resistant

Whether or not the ink, once dried on the paper, will resist being washed away with water.


Customer Reviews

Based on 29 reviews
Very Rich Ink

I recently purchased Robert Oster's "River of Fire" ink, and it has quickly become one of my favorite colors for writing. This ink exhibits a deep, balanced mix of green and teal, giving it a very rich character. The vibrant and well-blended shades offer pleasing shading properties, especially when used with my TWSBI Eco and its fine nib, which fully showcases the subtle yet exquisite variations.However, I noticed that with my Pilot Kakuno in a fine nib, the shading is less pronounced. For those who appreciate a more uniform color, this might actually be preferable. In terms of paper choice, I've found that cream paper not only enhances the ink's unique color palette but also complements its rich depths perfectly.While the sheen is minimal to nonexistent, achieving it requires very specific types of paper. Despite experimenting with various papers in my collection, I was unable to coax out any noticeable sheen. Nonetheless, the inherent qualities of this ink are so appealing that the lack of sheen hardly feels like a drawback. I am so taken with the "River of Fire" ink that I'm already planning to restock it to ensure I never run out. It's a must-have for anyone who appreciates the art of writing with beautifully crafted ink.

Amanda C.
Beautiful color, endlessly smudgy

I really love this color, but what is holding my back from buying more than a sample is the fact that it will smudge days later. I've tried many paper types and no matter which I used it seems to transfer to my hands and then everything else, clothing, desk, etc. This happens even after days of drying. I am heartbroken.

Robert Oster - River of Fire

Such a different color. This is not an ink you'd see everyday. Definitely is a creative product and love to find opportunities to use it.

Lease P.
Good coverage, smooth out of pen

This ink was bought because I fell in love with an orange so went on line for find other colors of subtlety. Want a blue that has the faintest hint of green,as light as if a veil of it had passed over. This Is not quite that but love it since the qualities I mention, coverage and smoothness very much here.Recommend highly. At least what I like. Each of us different.

Greg S.
A Beautiful Green

I've become a big fan of Robert Oster inks and this is one of my favorites. After loading up a pen from a 2 ml sample and writing a few lines of text, it was clear that I'd be ordering a full bottle. It's a beautiful shade of dark green and contains enough other color elements in the blend to keep things really interesting. I'm enjoying it as one of my primary every-day inks at the moment.

FAQs about Bottled Ink

Which pens can accept this ink? 8EDA1617-F73A-4DAF-8245-6D2BF4ABEB7B

Any of these fountain pens will work with bottled ink. Typically, as long as the pen can be filled with a converter, has a built-in filling mechanism like a piston, or can be eyedropper-filled, it can accept bottled ink.

What is shading, sheening, or shimmering ink? 8EDA1617-F73A-4DAF-8245-6D2BF4ABEB7B

Shading - A common (and often desired) result of a fountain pen ink pooling in certain parts of a letter when writing, so that the color and saturation of the ink appears different within a single letter or word. This characteristic cannot be achieved with ballpoint or rollerball pens and is a very appealing aspect of fountain pen use for those particularly drawn to all the pretty ink colors.

Sheen - Characteristic of a fountain pen ink where when ink pools another color can be seen on top of the ink, especially when looked at in different light angles using certain paper types. There is no way to guarantee an ink will sheen, but using a larger nib on a pen will help obtain sheening results in your writing.

Shimmering - Fountain pen ink that has small particles of glitter mixed in.

Is shimmering ink safe to use in fountain pens? 8EDA1617-F73A-4DAF-8245-6D2BF4ABEB7B

Yes! Shimmering ink is a great way to add some flare to your writing. We have found that a larger nib will showcase more shimmering particles while writing, but you can use any nib size and shimmering ink. All the ink we sell is safe for use in fountain pens.

You can learn more in our blog: How to Write with Shimmering Ink.

My ink smells funny, is it safe to use? 8EDA1617-F73A-4DAF-8245-6D2BF4ABEB7B

Generally yes! Ink does not smell good- it usually has a chemical smell, along with other scents such as sulfur, rubber, chemicals or even paint. However, as long as you’re not seeing anything floating in the ink, it should be safe to use.

It’s cold and my ink froze; is it safe to use? 8EDA1617-F73A-4DAF-8245-6D2BF4ABEB7B

Yes, frozen ink will not hurt your pen (after it’s thawed of course!) The issue with ink freezing is primarily a concern because certain glass bottles could break as the water-based ink expands, and then you’d have a mess!

What is your return policy for bottled ink? 8EDA1617-F73A-4DAF-8245-6D2BF4ABEB7B

We do not accept returns for ink that has been used. Otherwise, we accept returns on unused ink products for up to 30 days from purchase. You can read all our Return Policies here.

To initiate a return, please submit a request at the Return Portal. Our Customer Care team might reach out to you for more information.