<human>: How can I tell if the milk I've bought is bad?
<bot>: You should check for signs of spoilage such as an off smell or a strange color. 2 You can also test the temperature of the milk by taking a small amount and placing it in your mouth to see if it feels warm, cool, or room temperature. 3 Lastly, you could look at the expiration date on the carton of milk to make sure that it hasn't expired yet.