I like to write using a reservoir pen and i recently purchased a new ink that I have not tried before. This is the famour Rohrer & Klingner ink with the colour ”Solferino”. It is a beautiful deep purple hue and has a great lustre. The ink is not very expensive, water soluble and it is one of the most easy flowing inks that I have tried.
It works well in pens with a fine tip, because of the easy flowing characteristics I believe that you should probably not use it with tips larger than Medium size since it spreads itself really well.
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I bought mine from ”pennshopen” an online web store specialising in writing instruments here in Sweden. Price is 55 SEK and you can find it here.