The moment Chen Xuan saw the patch of black on the bracelet, he immediately ruled out simple oxidation. Silver jewelry might turn black after long periods of wear due to a chemical reaction with the air, but the blackening on this bracelet was clearly not caused by oxidation. As for whether it had been stained black by some kind of toxin, Chen Xuan could not yet make a definitive judgment.
"Yu Feitong, with the professional testing equipment your police force has, can't you identify what this black substance is?"
"If I could identify it, would I even need to ask you?" Yu Feitong, having felt flustered for a split second from being so close to Chen Xuan just moments ago, couldn't help but snap back.
Chapter 1429