In general you can use any brand of ink with any fountain pen, although some manufacturers state you get the best results when their ink is used with their pen. If you are using bottled ink in your fountain pen you will need a converter which is basically just a refillable cartridge that fits inside your pen. The choice between using bottled ink and ink cartridges is entirely personal preference but there is usually a much wider colour choice available with bottled ink (although slightly more fiddly to refill your pen this way). Diamine, in particular, have an amazing range of colours.
Diamine 30ml bottle of high quality 'Sunset Yellow' coloured ink, also available in 80ml bottles.£2.35Diamine 30ml bottle of high quality 'Yellow' coloured ink, also available in 80ml bottles.£2.35Diamine 80ml bottle of high quality 'Amethyst' coloured ink, also available in 30ml bottles.£5.95Diamine 80ml bottle of high quality 'Sunshine Yellow' coloured ink, also available in 30ml bottles.£5.95
Diamine 80ml bottle of high quality 'Yellow' coloured ink, also available in 30ml bottles.£5.95Diamine 50ml bottle of rich Citrus Ice Shimmer ink with beautiful silver traces.£8.95Artists' drawing ink 20 gram bottles in 14 strong colours, viewed as a high quality china ink based on a shellac solution.
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