Household ammonia to bring the PH up and battery acid mixed with distilled water at a 3 to 1 ratio to bring it down. I use an eye dropper and only use one or two drops at a time. I find that adding the acid or base to dye at a temperature between 135 - 140 degrees F works best. I use a small PH meter I purchased through Caswell to measure the PH.
I almost never have to raise the PH but usually have to lower it. But never add more than one or two drops at a time. Add the acid stir and wait before taking a reading. If you add too much you will have to correct using the ammonia again one or two drops at a time
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