Illumination! Colored Discharge Printing with vat dyes and Formosul

The nice weather has allowed some outside discharge work. I pulled some existing fabrics out of the van to work with; I think they have been improved. All three pieces utilized screens made with house paint.
First is a piece of muslin that was dyed with turquoise, fuchsia and I think, navy, then stenciled with fabric paints. I used a screen painted on the lightest weight (25 gm) Lutradur. The design is inspired by “Big Iris, by Philip Taaffe, 1985”. If you look at the picture enlarged, you’ll see the random non-woven fibrous structure of the Lutradur.
Second is a piece of snow- dyed fabric that I printed with a screen created with bubble wrap.  Easier and more predictable than printing with the wrap itself, as well as tidier.
Third is a piece of Radiance cotton-silk sateen, dyed blue with acid dyes. The first picture shows a major learning experience. Just above and to the left of center is a dark slit that shows how silk isn’t happy with prolonged periods of high pH and high temperature, especially when followed by a normal cycle machine wash. When I do this again with silk, I will only process the fabric one time!! This one had two cycles through the pressure cooker. The last picture shows a larger view of the fabric. The blue-violet areas were screened while the black circles were directly applied. Because of the density of the circles, you can see the halo really well.
The directions from Pro Chemical that I followed are found here. They advise that it is an intermediate to advanced technique. For a simpler approximation, try deColourant. I cleaned a screen with water squeegeed through onto a floor mop-up towel. It discharged by just hanging in the sun, the way deColourant does.
As always, thanks for looking. These fabrics will be on the website soon!