...Red on left, green for right. To remember, green and right have more letters in the words, red and left have less letters.
I ran up on a new couple of right and left about a year ago at a yard sale for $4. I don't think anyone else who saw them knew what they were for.
red's cut to the left and you use them with your right hand
green's cut to the right and you use them with your left hand
I hate to admit it, but I bought 10 pairs of these on one of the penny closeouts at Home Depot. They're my favorite snips now! I've got a red/green set in the car, at work, and in several places throughout the shop.

What's the difference between left and right?
I use one in each hand sometimes.
Here's an excellent video demonstrating proper use of snips. It was posted by a member in another thread, I don't know if the member made it.What's the difference between left and right?