This bottle of Stone Grey fountain pen ink from Graf von Faber-Castell contains the highest quality pigments. Each color in this ink line requires its own formula and inspired by nature. The excellent quality shows itself in the even flow of ink. You can start writing with the fountain pen almost immediately, even after long breaks. The elegant glass bottle of the ink complements the superiority of the ink. This 75ml bottle of Graf von Faber-Castell ink is also document proofed.