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Washable Blue
Platignum is one of the 713 brands in Inktend's built-in ink catalog.
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Paper & pairing
Blues and navies are the most broadly "safe" fountain pen colors: legible, professional, and unlikely to raise eyebrows in an office. This ink will behave predictably on most fountain-pen-friendly paper. Cheap, highly absorbent paper (standard copier paper) will dull any ink's saturation and can cause feathering or bleed-through with wetter nibs.
About Platignum
Platignum is a British pen brand registered in 1925 by Mentmore Manufacturing (itself founded in 1919), the name chosen because 'Platinum' could not be trademarked. For decades it supplied inexpensive school and calligraphy fountain pens as the value counterpart to Britain's premium brands, and the name has been revived in recent years for modern budget pens.
Storing and using the bottle
Bottled fountain pen ink has an effectively long shelf life when kept capped and out of direct sunlight: most inks remain usable for years. The main risk isn't the ink spoiling, it's a pen sitting inked and unused for weeks: that's what causes clogs, not the ink's age.
Frequently asked questions
Similar shades By colour distance
Color shown is a close digital approximation of a typical swatch, not a calibrated color match.