Type of writing instrument: Fountain pen Pen features/materials: Fine nib, Refills PILOT Single spare ink for fountain pens 50 pieces (2 pieces x 25 bags) The original color is blue, but as this is a very old product, I tested it out and the vividness of the blue has faded. It now has a color similar to blue-black, so I think you can use it as blue-black ink. Also, due to long-term storage, some of the ink seems to have become concentrated, and the volume may be about half of the original. As mentioned above, this is an old product, so please purchase only if you understand this. The storage condition is good, so the outer packaging is very clean. I have tested it, so there are no problems with writing. How about collecting this retro item?