We had a snow day today, so I used the unexpected bonus time and bonus snow to do some snow-dyeing.
Step 1: soak cotton fabric in soda-ash solution, crumple up and place on drainage rack in plastic tub.
Step 2: cover with several inches of fresh snow
Step 3: sprinkle fiber-reactive dye powder on snow. I use Procion MX.
Step 4: Cover and wait 24 hours.
Step 5: uncover and be amazed. Rinse in cold water until water runs clear. Wash with synthrapol and dry.
Step 6: press and be even more amazed.