How do I stop spashing all over the paper? I like the uneven look of the brush marks and don't want to use a mask, but I always end up with these drip and spash marks that I didn't intend. Usually it is only a couple - this is particularly bad example. I use a Richeson brush, fairly wide - 2 1/2 inch I think. I brush slowly and deliberately. I try to be careful, but seldom have a splash free paper. Any suggestions?