Chrome is both a custom marking and dye marking (upon release) which gives your waja a grayscale gradient marking, similar in effect to Rainbow (Marking). You cannot currently add this marking to your waja by use of a Dye Chrome, however it is expected to be available in the future.
Like Rainbow, changing the color of the Chrome marking does not affect the marking. It can be used in a similar way to Rainbow (Marking) to give the grayscale gradient effect to other markings.
This marking will look the same regardless of the hex color selected.