Ahsoka Episode 6 brought in the awe that was Thrawn's live-action debut, which was heralded by his iconic Star Destroyer, The Chimera. Within this epic display of unsettling power were some interesting details on the ship, as well as the stormtroopers. A gold or brass-like metal that has been used to augment and patch up both The Chimera and the armor of the stormtroopers was very prevalent in their designs.
Source：https://www.cbr.com/metal-ahsoka-episode-6-explainer/
