colorlidcold.jpg Cold
colorlidhot.jpg Hot
||

Description:

This plastic cup lid changes color when the contents are hot. This feature allows the user to know that the drink is hot. It also allows the user to judge the proper temperature visually. An uneven heat pattern can even indicate when the lid is not applied properly:
lidnotcorrect.jpg

Categories:

Mistake-proofing category: Mistake prevention, mistake detection
Setting function: information enhancement
Regulatory function: Sensory Alert
Source: Off-the-shelf


Links:

SmartLid.com
Explanatory Video

Secondary Problems (side effects, weakness or concerns) with this example:

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