Blueshine

Blueshine was a special magical quality that could be applied to metal armor, giving it a blue-black color and prevented it from being tarnished, becoming rusty, or being damaged by acid. It also allowed its wearer to hide significantly more easily.

Process
This quality was acquired by a series of actions in which the armor was heated, submersed in water and bathed in specific arcane solutions. The specially-enchanted liquids were comprised of a potion of sweetwater that was mixed distilled cockatrice feathers and drops of blood taken from a variety of species of dragons.

History
The formulation to enhance a suit of armor as blueshine had been practices by the dwarves of Faerûn for centuries prior to the Era of Upheaval.

During the 14 century DR, the Calishite wizard Toth created a spell that mimicked the process that created the blueshine effect. For his effects, he was soon killed by the Red Wizards of Thay.