My husband is a printmaker and has taught me a smidgen about viscosity printing. It involves using different viscosities of oil based ink in a monoprint or itaglio process in which the thickest inks act almost as a resist to the thinner inks. This may be completely wrong, but it is my blog and my memory so I am going with it.
|The ochre shapes were screened first this is a close up of the center of the image below|
|54" square of tight twisted seersucker silk|