The ring you see to the left of the centre near the top is not a mark on the back cover, rather it is the reflection of my camera's lens, (even though I wasn't using a flash). The plastic used for this cabinet is highly reflective and its semi-transparent quality makes the colour change appearance when the slightest changes in lighting occur. I find this both attractive and fun; and I do admit to having been overheard referring to the colour as "Chameleon Burgundy" before.