Option 2. The sword has been processed via PVD or anodizing giving the sword a multi-color and iridescent appearance which could look quite vibrant in the right light.
Option 3. Sword coated in thermochromic liquid crystal
Option 2. The sword has been processed via PVD or anodizing giving the sword a multi-color and iridescent appearance which could look quite vibrant in the right light.
Option 3. Sword coated in thermochromic liquid crystal