Glad to have you here with all of us basenji lovers. Have you pictures of your basenji? We would love to see them. :) Also, many people on here are 'related' by their dogs. Do you know the sire's and bitch's name?
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.