Why green on green bar paper?

One of the biggest business application my company builds uses green and white as the alternating background color in tables. This is due to the green bar paper used in former decades with line printers. I was wondering why they chose green.

Wikipedia only states that it was used to help the reader stay in one line, however this is, in my opinion, a consequence of the alternating background and not specially due to the green color.

Does anybody know why they particularly chose green and not any other color? Is that due to any ergonomic/usability reason?