And now you know
Sometimes, when a carton of milk has been in the fridge for a little while, taking a sip can be like playing the lottery. You can smell it, but sometimes even that way, you can’t be sure. You can ask the milk directly, but sadly, it won’t answer.
Well, it may not answer you, but with this packaging, you will be informed. Almost politely, the carton changes color to let you know how much time has passed since you opened the milk in your fridge. There’s no more need to risk your tastebuds again.