Ink that changes over time, sticking to traditional manufacturing methods
Blub black was developed because it required ink with excellent water and light resistance to store documents such as official documents. At first, the blue color of the dye appears, and then the iron in the ink oxidizes and changes to black, fixing. Today, the number of manufacturers that have inherited this traditional manufacturing method has increased. The characteristic of this ink is that it has a bright dye color at the beginning of writing changes to black over time and has water resistance and long-term storage stability. "Classic Ink" is a fountain pen ink that you can enjoy the process of color change that was developed with a particular focus on "the handwriting turns black over time ." In addition, this ink further emphasizes the shade of the handwriting, making the letters are written with the fountain pen tastier. Enjoy the ink that brings life to you right after you write it.

Platinum Classic Classis Black iron gall fountain pen ink, with a built-in reservoir for easy filling. The color will darken on the page within the first 24 hours after writing, even as soon as one hour later you may see a difference.

From Platinum:
Fountain pen inks that are produced using traditional methods have many times been replaced with an ink that is made by mixing dye inks due to their time-consuming production techniques. Meanwhile, Platinum Pen is currently the only company in Japan that manufactures blue-black ink in a classic way.

The ink color that is bright when you start writing becomes gradually black. It is also highly water-resistant and suitable for permanent preservation. This time, we have paid close attention to the process of changes in the color of the classic ink, and have released six new colors with the aim to enhance the joy of using fountain pens. Emphasis on the shading has been placed, offering rich deep writing. Please try our CLASSIC INK that will further expand the ability to enjoy writing with the fountain pens.