And recently, the British site Flavor has announced new experimental results that the color of the mug makes the coffee taste different.
In this experiment, any subject drinks coffee poured into "blue", "white", and "transparent" mugs, and evaluates sweetness, bitterness, and strength of taste. As a result, it was found that coffee in a blue mug is more sweet and coffee in a white mug is more bitter.
Researchers seem to hypothesize this result as "the" color contrast "of mugs and coffee may affect taste." In other words, the white mug seemed to have increased taste intensity and bitterness due to the color contrast with brown coffee.
It's up to us to believe it or not, but on a bad morning you might dare to drink coffee in a white mug. Maybe it feels a little stronger than usual and makes your head feel refreshed (you can get an illusion).
* All images and graphs are from Flavor