Adding salt while the paint is wet will absorb the water and pigment, leaving a "blossom". You can use regular table salt for small "blossoms" or as I did in this painting, Kosher salt which makes larger "blossoms".
My goal was to get more texture and more contrast and more intensity. However, too much salt soaked up all of the color! Now I have a problem to solve.
To achieve my goal within this section, all I had to do was add a little more form to the shapes created. But because I lost most of the intensity, I will have to repaint this area. The problem is the salt, which not only absorbs the water but also absorbs the sizing in the paper. As a consequence, putting another layer over that area results in a loss of transparency. The paint will soak into the paper and the underlying paint layer. So, in this case, I had to switch to staining pigments, phthalo green and olive green.
On to the next step!