Platinum Classic Sepia Black Ink
Platinum Classic Sepia Black Ink
Platinum Classic Sepia Black Ink
Platinum Pen Co.

Platinum Classic Sepia Black Ink

$32.00

This classic iron gall fountain pen ink is made using traditional methods rather than modern dye-based formulas. 

Platinum Classic inks are carefully formulated for beautiful shading, strong water resistance, and dramatic color shifts. As the ink dries, the iron content oxidizes from clear to dark gray, transforming the original pink into a refined, off-black finish right on the page.

  • 60 ml / 2.0 oz
  • Glass bottle
  • Water-resistant
  • Iron gall ink
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Founded in 1919, Platinum Pen Co. is a renowned Japanese writing instrument manufacturer known for its dedication to quality, innovation, and craftsmanship. With over a century of expertise, Platinum has built a reputation for producing reliable fountain pens and exceptional inks that balance traditional techniques with modern engineering. From precision-made nibs to industry-leading pigment inks like Carbon Black, Platinum’s products are trusted by writers, artists, and stationery lovers around the world. Designed and manufactured in Japan, every Platinum piece reflects a commitment to longevity, performance, and the joy of writing.

Acidity

Iron gall inks are mildly acidic, but not to a harmful degree. While people often associate “acid-free” materials with long-term preservation, historically, official records were written with acidic iron gall inks - and many of those documents have survived for centuries in excellent condition. The acidity in modern iron gall inks is very low, so although paper damage is technically possible, it’s unlikely. Today’s formulations are significantly safer than their historical counterparts.

Safety & Use

Platinum doesn’t list specific usage restrictions, but a little extra care is recommended. Iron gall inks aren’t the best choice for especially valuable pens, as their mild acidity and higher risk of clogging can cause wear over long periods of continuous use. It’s best not to leave this ink sitting in a pen that won’t be used for a while, and regular cleaning is advised. That said, modern fountain pen–safe iron gall inks like Platinum Classic are far gentler than traditional versions and can be used normally with proper maintenance.