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Turquoise
Plotube 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 Plotube
Plotube is a calligraphy supplies brand that sells through Amazon storefronts in the United States, Canada and Australia. Its main product is a boxed calligraphy set combining a wooden dip pen and antique brass holder, gold and stainless steel nibs, an instruction booklet and seven bottles of coloured ink (black, red, orange, purple, green, turquoise and hot pink) which are the colours catalogued under the brand name. The sets are marketed at beginners and gift buyers rather than sold as standalone fountain pen inks.
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.