Ace, double negatives equals a positive, but I bet you know this. Crafty of you to catch double negatives, you are educated yet humble. Your past text indicates to me your knowledge of physics or similar. Your past post on infrared, spectrometer, refractors that is, lasers and comments on humidity or uncommon. Good to know stuff. Why NOT so UNhumble? OK, I get the bad joke award for previous sentence.
Blessings