Diamine Prussian Blue is quite simply gorgeous, and I wasn't expecting it. I came across this ink by chance and I am very very pleased I did. I bought my husband a Kaweco fountain pen and Diamine Prussian Blue ink cartridges as a present as I felt he needed a good pen. I chose Diamine Prussian Blue ink as he prefers a dark ink colour and has a love of all things grey.
When it turned up, naturally the pen geek in me wanted to give it a go. Quite simply, had I been wearing socks, it would have blown them off.
At this present time Diamine is my favourite ink brand. They are great value for money, a 30ml bottle set me back less than £3. The ink flows consistently well and dry times are good. For the Prussian Blue the tone is lovely. I would describe it as a blue-black ink but not in the traditional sense. This ink has hints of grey which gives it an edge that I haven't seen it other blue-blacks. It is also more blue than black. A quick google search and wiktionary informs me that this pigment colour was actually discovered in Prussia around 1700. I am a part time history student so this discovery just added to my love.
To enjoy this ink even more I have it inked up in a demonstrator pen. Even in the ink reservoir it looks dreamy.
Diamine Prussian Blue with be a blue-black ink that I will always use. If you haven't tried a Diamine ink, or are looking for an affordable blue-black then I urge you to try this ink.