Wet pulp is difficult to control to say the least! Unlike paint that can be applied with a brush, pulp dispersed in water is slippery and shapeless. In fact, the ratio of water to pulp in the wet stage is approximately 90/10. To help control where the pulp lands on the surface of the in-progress painting, I use a metal ruler as a barricade of sorts. I hold the ruler in place with one hand, and, using a turkey baster to gather the pulp with, I squeeze the pulp filled baster onto the section of the painting in which I want to direct the pulp.
