DE ATRAMENTIS Deepwater Obsession Fountain Pen Ink 35mL - Black BrownDe Atramentis Deepwater Obsession Color: Black Brown Content: 35 ml The worst thing for fountain pen ink is light. No matter if it is sunlight or artificial light. Therefore, this kind of ink should not be stored under the effect of light. What a pity that the ink with the nice ink bottle has to be stored in a dark cupboard. But we found a solution for this problem: Black ink bottles! De Atramentis present five new ink colours with black ink bottles.