"Sadly for you, what I want to test is magic." Almost certainly magic, even if it was inherent. Something he should be able to do, something he should have learned to do, if....

Bah. Loki concentrated, pushing away Odin's enchantment, forcing the lined blue skin and red eyes of Jotunheim to show themselves, letting the chill of a frost giant radiate as it would. (Enough, perhaps, to damp some of the heat from that fire.) Another thing that wasn't exactly a secret; Thor could share, if he was inclined. There was no harm in showing this to Thor's human. "No science involved."