![Infinity ECO Fountain Pen Bottled Ink Series [60 ml] by Private Reserve Ink](https://passion4pens.com/wp-content/uploads/2025/12/Infinity-Blue-Black-30-ml-Ink-Bottle-with-ECO-Formula.webp)
The Private Reserve Infinity inks feature a brand new, exclusive Extended Cap Off Formula (or ECO Formula). What does that mean for fountain pen users and artists out there wondering what makes this ink so special?
Infinity Ink’s ECO Formula: Game Changing Technology for Ink Fans
Private Reserve Infinity Blue/Black ink combines deep blue with the richness of black for a versatile color. Known for its consistency and vibrant appearance, it resists fading and feathering. The extended cap-off time ensures ink freshness, supporting continuous writing sessions.
Additional Information
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Exceptional Color Saturation: Intense and vibrant hues
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Reliable Performance: Consistent results with every use
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Extended Cap Off Time: Ink stays fresh even when the pen is uncapped for extended periods
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Quick Drying: Reduces the risk of smudging and transferring
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Versatile Use: Ideal for students, professionals, and anyone needing to pause writing frequently
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