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New greys (bley) are Medium Stone Grey and Dark Stone Grey.
Old greys are Grey and Dark Grey.
Bricks after 2004-2005 will be the new gray, if that helps.
There was only 1 shade of gray from the first small plates of the early 1960s (Cellulose Acetate) until 2003. But depending on storage conditions it could have quite a variance in color. Same for blue parts. The "yellowing" effect was different for each part. But unlike some colors... the only way to tell Cellulose Acetate parts from ABS parts in gray was the warping (and things like pip locations).