The application process is relatively simple, requiring only a paintbrush and spray bottle.
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Clean off the area you wish to stain with your soap and water. The stone should be as clean as possible to ensure a good acid etching.
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Mix the acid stain according to the manufacturer's directions in your spray bottle or garden sprayer.
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Spray the stone with the acid solution.
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Brush the acid solution around on the stone with your brush. This will both work the acid into the stone as well as give it a more "random" appearance, enhancing the aesthetic value of the piece.
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Allow the stain to dry, then apply a second coat in the same manner as the first.
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Mix a cup of baking soda into a bucket of water and pour a small amount of the mixture over the acid after the second coat has finished drying. Brush the mixture over the acid. Concrete-Stain.com recommends this to neutralize and rinse away any remaining acidic traces.
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Wash the stone off with clean water after applying the baking soda mixture.