The secret to its timeless black color is the black dope-dyed thread that is dyed all the way to the core. "Black dope-dyed thread" is a thread that is colored and spun at the fiber stage before it is made into thread. Because it is black not only on the surface but all the way to the core, it is less likely to fade than regular piece-dyed threads, and the vivid, beautiful color lasts longer.