Most helpful positive review
8 of 8 people found the following review helpful
They work just don't put them in the dishwasher and they never quite get past a dirty gray color no matter how hot.
on December 3, 2014
As always, despite receiving a free product I'm perfectly candid in my review. I want you to have as good an experience on Amazon as I do.
* The dark cup is pretty much as shown.
* Cup begins to change at 119 degree surface temperature.
* However, even at 125 degrees the cup does NOT look like the white picture. Does finally start to look similar to the picture around 165 which is furiously hot for anything you want to hold in your hand or put in your mouth.
* As stated in just about every review, do NOT put this in the dishwasher or you'll just have a cup.