Very interesting, and glad to find this thread. I just posted a new thread, "Problem with R-0870" with similar issues. I can't get the solutions to go clear during the test, and am guessing at the results. Never had this before in 4-5 years. My test kit is inside my workroom, not air conditioned, and sometimes gets into the 90's. In central California the humidity never gets above 20%. I screw the lid onto the R-0870 tight. That stuff was clumped when it arrived, fresh, a few months ago, and has gotten darker and darker. My test vial is also stained purple.
I'll ask TFT for a replacement.