|I often see people confusing the colors "green" and "aqua", or "hemingray blue" and "cobalt blue". While they may be similar in name, those slight variations can make a HUGE difference when it comes to value! (We're talking $5 vs. $500).
Here is a simple color guide that shows some of the various colors that the Hemingray Glass Company produced. This is by no means a complete representation, but should at least serve as a starting point for basic colors.