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Polarcloud
Ostrich 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 Ostrich
Ostrich (Tuoniao) is one of China's oldest ink manufacturers, established in Tianjin in 1935 and later operating as Tianjin Ostrich Ink Co., Ltd. The company developed its blue-black iron gall ink in 1942 and today produces fountain pen, calligraphy and other inks, exporting to some twenty countries and regions across Europe, America and Asia.
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.