As You can see in the scan above, the quality of RITEK-made SONY BD-R25 6x can be very bad to the end, I can confirm it from own experience.
If You find this æ—¥æœ¬è£½ on a spindle or package, is means "made in Japan",
if You find this å°æ¹¾è£½, it means "made in Taiwan".
You can see images of different spindles and packages of BD-R25 6x, it is said where they are made amd which mediacode they have.
moderator note: merged this relevant post from the Sony BDR scans thread instead of creating a new thread. -Albert