Bummer. Hot nitric acid might. It is my impression that the plastic is getting harder to dissolve.
Tom
I can't agree more on that.
But what I'm saying is that a big part of the counterfeits are literally indistinguishable visually and to check them you need to go a step further.
As I see it, the DIY community suffers a lot from counterfeits as the guys rush to get the "good deal" and ask later.