Instead of Grandkids May I Interest You in a Mug? Color Changing Mug - Reveals Secret Message w/ Hot Water
The mug starts out a glossy black color. When hot liquid is added the brilliant color message appears and the mug turns white! Surprise your friend with a secret message.
To see it in action click here! https://youtu.be/9Aykgj-irXk
Available in 11oz.