Slight thread drift, I know, but third-party toner for my HP ColorLaser don't seem to fade at all. I printed a test sheet - or rather two A5 test sheets on one A4 paper three years ago, stuck one to the front of a filing cabinet and put t'other into an envelope in a drawer. No fade on the exposed one... unless they both faded irrespective of incident light. V happy with supplies which cost a quarter of the OEM stuff.