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My dad and I once used Blue and Green food coloring to make he ice look like open water on the ponds by our house. Had a five gallon bucket full of water(nice if there is a stream/creek or open water nearby so as to fill buck), added food coloring to desired color and threw out over an area on the ice. I guess from above it looks like a nice spot of open water on an otherwise frozen pond or lake. The only time we tried the trick we downed two geese.