Interesting.  Keltham is guessing that they've never, say, compared a 1-foot cube of spellsilver to a 1-foot cube of depleted spellsilver to see whether one is 0.01% denser than the other, on grounds like 'Nobody has that much spellsilver' and 'We don't have weighing-instruments fine enough to detect that difference off a 1-inch cube instead'.  But if somebody by any chance has performed that experiment, Keltham would like to know...?

Interesting.  Keltham is guessing that they've never, say, compared a 1-foot cube of spellsilver to a 1-foot cube of depleted spellsilver to see whether one is 0.1% denser than the other, on grounds like 'Nobody has that much spellsilver' and 'We don't have weighing-instruments fine enough to detect that difference off a 1-inch cube instead'.  But if somebody by any chance has performed that experiment, Keltham would like to know...?