The sensation is... not like the slippery feeling you get when using soap, so it couldn't be basic. It's more akin to... Yes, the smell of vinegar confirms it. The sensation is definitely akin to the tingling and tightness that you get when you used to have to clean metals in vinegar or other mild acids at the temple. That's why it feels familiar...
You manage to pick the metal egg-pod clean of small items, which number 35 of the metal discs you know as "silverdisks", a Numerian form for currency each worth 10gp, and the silver bracelet. After checking it over thoroughly for a little bit, you believe that the item might actually be some kind of force shield generating device. The circular parts at the ends each sport an inner white dot, and the central band of the three connecting the circlular pieces is also white. Though giving it a good shake and whatnot, you're not confident that this item is going to function all that reliably...
(( You gain 35 Silverdisks and a Force Field (White), DamagedMechanically, this grants the wearer 15 temporary hit points, but due to damage the bracelet sustained, there is no way to recharge these temporary hit points. Further, after maintaining this field for 24 hours, the bracelet permanently runs out of energy. ))