How can you tell difference between an original ps2 game and a pirated game?

[cheryl771]

Some of the discs say pal and some say ntsc. On one it says pal on the outer case and ntsc on the inside. Some are gold on the bottom others are silver. No purple on the bottom at ALL. They do NOT have ps2 logo on the inner plastic part os disc. They have on the inner ring of the disc the name of the game printed in English. The discs have the pics on the label side are NOT printed off a computer but look like they are original. One of the legal disclaimers in small print has a spelling error. I think these were made in china or out of hong kong. They look VERY real. But when I see chinese/japanese printing anywhere I am suspicious.