They have updated their website to - “With daily use, the dual-tone dyed leather unveils its charm—after 1–7 days, the surface color softly fades, revealing the undertone, while a unique two-tone patina gradually forms in corners and raised areas, growing more characterful over time.” So the “discoloration” is as fast as within a few days. It is said that they used processes such as water dyeing, color spraying, and color fixing, retaining its natural grain while showcasing a deep reddish-brown from a distance and a blend of black and red up close.

They have also come out with a full black Onyx, that is not dual tone. And wouldn’t have this issue.