The two red pieces and the purple/blue/red a couple of posts below are all made from a white sheet an exchange student left at my house a couple of years ago.
I bought the supplies from Dharma Trading company
I prewashed the fabric in Synthropol. Then I soaked it in a soda ash solution. While it was soaking I prepared my urea and salt chemical water. I laid the fabric out on several different types of racks. The article I read in Art Quilting stated that she used a piece of plexiglass and tilted it into a pan so that the fabric did not sit in the excess dye. I used two small pieces of plexi tilted in my favorite pan (it is designed for fish cleaning and sold at sporting goods stores).
I also used a small baking rack over a dish pan and a shoe box sized plastic box. In the bottom of the plastic box I placed some bubble wrap with really large bubbles. I also slanted this so the dye would run down.
I then put the wet fabric on the racks and covered it with snow.
I mixed the dye two tables spoons to a half cup of chemical water. Then poured it on over the snow. I then covered it with plastic bags and left it overnight.
The next day I sprayed all of the fabric with warm water, wrung it out and hung it to dry. I will wash it with synthrapol in a few days.