I’ve had my cast iron set for about 10 years now and use it a few times a week. I just noticed this past weekend while sautéing some onions in my dutch oven that there were small black flakes mixing in with the food. I realized it was the bits flaking off from the bottom of the dutch oven. Are these pieces of the seasoning or coating? I’ve never officially seasoned the set and have always hand washed them. I’m not sure how to remedy this problem. Should I scour the bottom until I’ve gotten the whole peeling layer off? There are small circles of peeled areas all over the bottom.