Colour Change Mugs

colour change
(colour changes) (in  coloration (biology): Short-term changes)
The changing of chips to a higher or lower denomination (Different chip colours designated the chips value).
visual changes in the colour of the wood species caused by exposure to light, deprivation of light and air, or some chemical reaction.

mugs
(mug) rob at gunpoint or with the threat of violence; "I was mugged in the streets of New York last night"
(mug) chump: a person who is gullible and easy to take advantage of
A large cup, typically cylindrical and with a handle and used without a saucer
The contents of such a cup
A person's face
(mug) the quantity that can be held in a mug