Here are the pieces we made using black thickened dye applied with a hogs hair brush.
This was a silk screen on the last piece of fabric neither of us wanted. Good thing. It's ugly.
They dried quickly on the hot pavement. When bone dry, I washed them in cold water with 2 color catchers, retayne and Synthropol. Retayne aids in retaining the color and synthropol aids in preventing dye back. The color catchers grab all the free dye molecules in the wash and trap them which also helps in dye back.
Here they are washed dried and ironed.