I'm saying it's a bs statement. It isn't about coffee. Tell me 19 cheeses that age and go from white to yellow. You can start by saying cheddar doesn't. There are near 0 and if you think that's not true, you are being lied too. Make a cheese, it won't randomly turn unless you add something that makes it. It's like saying copper turns to brass on its own. It doesn't. Sorry for being upset about it, but it's just bologna Edit: also if it changes color without you adding something that you knew would change the color, throw it out, be safe; there is an unknown bacteria added if you didn't do it yourself