They say you can't always judge a book by its cover. Well, this is also true for cooked foods. You can't judge if your food is done by looking at its color.
Color can be misleading.
For instance, USDA research shows that one out of every four hamburgers turns brown in the middle before it is safely cooked. Using a food thermometer is the only way to tell that food has reached a high enough temperature to destroy harmful bacteria. Also, research shows that less than half the population even owns a food thermometer. And only 3 percent use one when cooking foods like hamburgers at home. Left out of meat, poultry, egg dishes, and other cooked foods.