I've been meaning to do this for awhile! After being basenji-less for over 20 years, we recently adopted a 9 yr old girl from BRAT. Pippi is wonderful and we feel so lucky to have found her.
Bungwa has a very dry mouth and I only managed to get a very tiny white patch on the test card but it was still sufficient to do the test with that. It only turns white when it's dry - the instructions are quite explicit. Of course as Pat says it could be a bad test form.
Welcome! This is a great forum to gather information on. Im sure you will be able to find the answers to many questions you may have along with some "b" friends.