It has been so fun to find this forum and read about Basenji behaviors. We've recently relocated to Washington, D.C. and I would love to meet up with other Basenji owners in the area!
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.