How to tell if old china is Dishwasher Safe?

Making room in the basement and found a big ol box of China that I remember we used when I was a kid. It is marked on the bottom Colonial Homestead by Royal Apparently my mom was collecting these a long time ago and we have service for 14. Well, there are a serious butt load of dishes in the set and I was wondering how to tell if they are ok to run through the dishwasher. I’m sure they aren’t “collector” dishes, but a lot of family memories here. What happens to dishes that are not good in the dishwasher go in anyway? Are these safe?