These 6 tees were purchased in 2000 - 2003, and they were stored in the wardrobe since 2005 ... which means they didn't be worn for 2 years! Although I packed them with other old tees in a large plastic bag for protection, their collars are still turned yellowish. Luckily the yellowish mark can be cleaned after washing by a washer with powder.
The above photos were taken by an old digital camera 'Minolta Dimage F200'. In fact, the respond time of this old DC is damn slow, but it really works, and the main point is its price, just HKD340!