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Principle:The wet phenolphthalein test paper turns red against the ammonia gas, so the main function of the phenolphthalein test paper is to detect ammonia gas NH3. Production Method:Dissolve 1g of phenolphthalein in 100ml of 95% ethanol and add 100ml of water while shaking to make a solution. Soak the test paper in it, soak it, and dry it in clean and dry air.