I used to throw them in my purse and spend them, but I really didn't like handling the crusty things and felt a bit guilty giving them to merchants. So now I just toss them once I am sure what they are. Very important since I once dug what I thought was an extremely encrusted zincoln penny, but as I gave it a second look, realized that the size was just a hair smaller than a penny. After soaking it in lemon juice and picking the crust off, I was looking at my first seated dime. Really really thin from all the corrosion, but readable.