Is a high quality concentrated liquid watercolour ink originally made for designers, graphic artists and illustrators. However many use it as an ink, as it behaves just like watercolour, as it is literally a liquid watercolour.
The differance is that is an concentrated watercolour is more bright and vibrant to the eye and gives more contrast then normal watercolour.Ecoline has a good range of 48 watercolour inks to choose from also is an watersoluble ink.
Here you can find some examples of how is been used http://artshoponline888.blogspot.it/2011/05/other.html
Hope you like it