The white egg layer was the leghorn. I've heard you can tell the color of the egg by looking at the color of the feathers over the chickens ears. Have no idea if it's true or not but you can look up all kinds of info on the different breeds you have and maybe check out your future additions. I want some easter eggers. Or an olive egger so I can have green eggs and ham sam I am.
I had just thought of this since your new to raising chickens but you can save your egg shells when you eat the eggs to crush up and let your gals eat them to replenish the calcium they used to make them. I use a large hominy can that I put my shells in and then crush them to little bits in the can with a metal rod. You can mix in the crushed egg shells into yummy stuff so they eat it. Just make sure you mash it up so they can't tell what it was. Don't want them thinking "hey that egg I laid looks like that yummy stuff she feeds me."
Have fun.