Just wanna bring this to your attention. We often complain about white finishes yellowing off over time. This isn’t obvious but the pic above is my (poor) attempt to show you that all finished would yellow off in due time, the darker based ones would display a less obvious change. Is there a definite prevention measure to avoid this from happening? No. Sweat, condensation, light & bag/hard case interior, among others, contribute towards this. If it’s a relic finish, we wouldn’t mind at all but if it’s a well-taken care instrument, it’s painful seeing something deteriorate; slowly but surely.