Cups with white insides
April 6, 2007 7:43pm CST
Why do manufacturers insist on making tea and coffee cups with dark or patterned outsides but plain white glazed insides which show every little mark? And who do people who refuse to wash up regularly always seem to buy and use these cups - ewwwwww!
7 Apr 07
tea or coffee are hot drinks and should be kept hot till the last sip to maintain their taste. Now white surfaces are believed to reflect light while black absorbs heat radiations. If the inner walls of the cup are designed white, then it helps in retaining the heat of the drink by not allowing the heat radiations to escape through. while black surface continuously absorbs heat of surrounding and helps maintaing the temprature of the surfsce of cup