yesterday i was fucking around and tossed some copper in conc. nitric acid and it started degrading (obviously) but when i did the same for fuming nitric acid, it instead took much more time in degrading copper as compared to conc. nitric acid
So in short
>conc. nitric acid degrades copper (conc = 60-74% approx)
>fuming nitric acid degrades copper much slowly even though the conc. being much higher (around 95%)
WHY??