Platinum's Pigmented “carbon ink” is known for having one of the most intense colors even today.
When using the ink, a number of cartoonists and manga enthusiasts have stated that they typically take apart the cartridges and transfer the ink to bottles. This ink is archival grade and water resistant when dry so it can be used to paint over with water-colour. Due to application of ultra-fine particles, PIGMENT INK is chracterized with improved chromogenic,quick-drying and water-resistant. With this ink the written characters remain firm, thus very suitable for writing on your diary, letters etc.
Also available in 6ml samples here