Brass is a mild-natured metal, widely used in various magic experiments. Engraving is also a common carving technique, extensively used in talismans, arrays, and even alchemy.
The letter 'M' on the copper plate is likewise unremarkable, belonging to a universally adopted font in the wizarding world. From yesterday's Beta Town Post, to the latest edition of the Great Encyclopedia at the Three Flavor Bookstore, it can be seen everywhere.
In short, based on the half-baked detection skills of several young wizards, it's completely impossible to determine which wizard's laboratory this copper plate originated from—or even if it really came from a wizard's laboratory, they weren't quite sure.
The strange spine flowed among the young wizards, and they tossed all sorts of detection magic they knew onto it, yet no clear reaction appeared.
The one-eyed crow also pecked at the piece of bone, but aside from learning that the bone was brittle and hollow, it also found nothing.
