Robert Oster Signature Inks--Thunderstorm 50ml bottle
Robert Oster Signature Inks are known worldwide to fountain pen users as top-quality ink with a wide variety of colors. Some very unique colors. Robert and his company believe in making the world a better place by giving back. Giving back to the world in general and giving back to the pen/ink community. Thunderstorm is a grayish blue and black, comes in a 50ml bottle.