Just reading up on the process in a book by Peter Mrhar, he mentions using acid water in the context of making an under exposed photo darker, below is a quote from his book called Cyanotype
"If the photograph is under exposed, that is, if after development in water on a test sheet only white patches are seen instead of light greyscale values. the photograph can be darkened by developing it in acidic water. Darkening depend on the acidity of the water. The more acidic the water the more lost bright tones will be recuperated. In doing so we will soon notice that too much acidic water brings a loss of brighter tones, which gradually change into a single muddy spot."
Ian
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