Vin began to nod, then froze. The pulsing had stopped.
“What happened?” she asked.
“I started burning copper,” Kelsier said, “the companion to bronze. When you burn copper, it hides your use of powers from other Allomancers. You can try burning it now, if you want, though you won’t sense much.”
Vin did so. The only change was a feeling of slight vibration within her.
“Copper is a vital metal to learn,” Kelsier said. “It will hide you from Inquisitors. We probably don’t have anything to worry about tonight—the Inquisitors would assume us to be regular noble Mistborn, out for training. However, if you’re ever in a skaa guise and need to burn metals, make sure you turn on your copper first.”