1999 Pokemon Base Set Booster Pack Black Triangle Error Blastoise Art PSA 8 on Fanatics Collect Identifying Shadowless & Unlimited Base set Boxes & Packs Articles Elite Fourum Just found this unopened error black triangle pack in my old card collection. Was considering getting it graded but was curious if anyone could explain what the difference is between a PSA 10 and PSA 9 unopened pack? There's no rips or anything, but the If you happen upon an unopened #Pokemon pack and notice a little black triangle on the bottom right, then it's your lucky day. Those packs are known as "Black Triangle Errors" and Base Set Black Triangle Error Loose Packs Trading Co. Sealed Unweighed Pokemon Base Set Black Triangle Booster Pack Charizard Art eBay