How to Snow Dye
Prewash cotton fabric in Synthrapol and hot water.
Soak 1 yard cotton fabric in a solution of 2+1/2 T soda ash (sodium carbonate, NOT baking soda), to 1 qt. hot water.
Wad fabric up, and place it in a plastic bag.
Pack snow firmly on top of fabric, until bag is stuffed hard, and barely closes.
Pour on liquid dye solution, 1T Procion MX fiber reactive dye, mixed in 1/3 cup water.
If you want more than 1 color, add it now.
Close the bag, place it in a bucket, and let the snow melt.
Leave it only until the snow has melted, about 12 hours, then wash in hot water.
Rewash until rinse is clear.
Have fun.