I'm sure (well sort of...) that I read, that once the developed paper was put into the stop bath solution, one could then look at the paper under white light, as there is no developer to do any more work...?
So in principle, if the above is correct, you don't even need to fix the test strips at all, if you just want to view them and not keep them. Only by trying this and seeing is the only way to test it I suppose,
I'm quite happy for anyone to correct me if I'm totally wrong in my memory.
Terry S