Definitely one of the most desirable vintage brands, Urban Decay was first released way back in 1996.
All of my Urban Decay polishes are second generation from around 2001. I did have a first generation polish (a silver holo) in the iconic bottle but stupidly threw it away as it had dried out - before I knew that practically any polish could be revived with enough thinner! I have mentally kicked myself so many times since that sad occasion....
AC/DC is a slightly blackened muted cool purple foil.
Application was great, swatches are 2 coats, no top coat.
Urban Decay polishes do pop up on ebay quite regularly if you fancy dipping a toe in these vintage polish waters...
Urban Decay is now owned by the cosmetics giant L'Oreal.