1. If you expose the darker blue version to sun light for some weeks, you can convert it into the light blue version or something in between. :)

    In my experience, the red color stays the same, but the blue will fade.

  2. No, I’m not Urs Wyss. :-) I sell Victorinox knives in a shop. Actually, not all translucent blue knives seem to fade. In fluorescent light, for example a CyberTool 34 and a “My First Victorinox” faded, while a Mountaineer Lite and a Huntsman didn’t fade.

    Maybe Victorinox changed the “formula” of the translucent blue handles in the meantime, and newer knives are no more affected.

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