Did you get that from fort? I'm not sure, but he might have replaced its original contents with some plain ole bromethyl blue. You need 4dkh solution, and a color indicator. API pH test solution works well. If that's bromethyl blue, it's the same stuff as the API pH test.
"What, exactly, is the internet? Basically it is a global network exchanging digitized data in such a way that any computer, anywhere, that is equipped with a device called a 'modem', can make a noise like a duck choking on a kazoo." - Dave Barry