2 tbsp soda ash in 2 cups water.
Approx. 2 tsp dye in 100 mls.
Soaked 12 15″x15″ squares fabric in soda ash. Layered 2 pieces each in foil pans and disposable Tupperware. Packed snow on top, drizzled dye over snow. Pure turquoise, fuchsia, yellow, and 50/50 mixes of each pairing. Let sit for 24 hours.
No grate, so this was sitting in the melted snow water. Overall, had 12 tsp dye in 2.5 cups water, plus snow. Colours were strong.