This ink cake is for quick, easy use while traveling. It does this very well. I used this with a B10 Piston Waterbrush and it was the easiest thing to use. The ink mixes quickly for use. It can be seen on the brush so you know how thick it is. You can feel the ink when you paint. This is not liquid ink and does not feel like liquid ink but it is not supposed to be a liquid.
Here are two quick sketches, the first I did with this ink cake:
The ink cake is very small and will fit into a pocket very easily. There is plenty of ink to last a long time. I will be buying more to keep handy.