Graf Von Faber Castell Ink BottleInspired By The Colors of Nature The manufacture of Faber Castell indelible inks for fountain pens is an art form. Each one of the vibrant colors inspired by nature requires its own formula and the highest quality ingredients. The excellent quality shows itself in the even flow of ink and the fact that you can start writing with the fountain pen almost immediately, even after long breaks. An ink is called indelible if it is smudge resistant,