50ml plastic bottle of Robert Oster Signature fountain pen ink in the green color Citrus.
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.
Reviews & Questions
Which pens can accept this ink?
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?
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.
Shimmering - Fountain pen ink that has small particles of glitter mixed in. 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.
Is shimmering ink safe to use in fountain pens?
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.
My ink smells funny, is it safe to use?
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 is safe to use.
It’s cold and my ink froze, is it safe to use?
Yes, frozen ink will not hurt your pen (after it’s thawed of course!) The issue with ink freezing is 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?
We do not accept returns for ink that has been used. Otherwise, we accept returns on unused ink products for up to 60 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.
Robert Oster Citrus - 50ml Bottled Ink
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