1. The core difference between white and black thermos cups
(1) Temperature retention capability
Black has strong heat absorption, but the insulation layer of the insulated cup (usually vacuum+copper plating) is the key to determining the insulation effect. Experiments have shown that white and black insulated cups of the same brand and model have a temperature difference of only 0.5 ℃ after 6 hours at a water temperature of 95 ℃ (data source: “Performance Test Report for Insulated Containers” by China National Institute of Standardization). The influence of color on insulation performance can be ignored.
(2) Cleaning and durability
White is prone to stains (such as tea stains and coffee stains) and requires frequent cleaning; Black is more resistant to dirt but may conceal internal dirt, and long-term lack of cleaning can easily breed bacteria.
If the black surface is coated with baking paint, its wear resistance is 30% higher than that of white (reference: TIGER insulated cup laboratory test in Japan), but the scratches on the light colored cup body are less obvious.
2. Expand consideration factors
(1) Adaptation to usage scenarios
Office/business occasions: White appears cleaner and fresher, while black tends to be more stable. Outdoor activities: Black is dirt resistant and absorbs heat quickly, providing a warmer grip in winter; White reflects sunlight, suitable for avoiding overheating of the cup body in summer.
(2) Psychological and Health Effects
Psychological research (published in the journal Color Psychology) suggests that white color is associated with a sense of cleanliness and may promote a desire to drink water; Black gives people a sense of professionalism, but some users may feel suppressed.
If acidic drinks (such as lemonade) are stored, the dark inner container is more likely to hide corrosion marks, but the actual material (304/316 stainless steel) is the key to rust prevention.
(3) Special functional requirements
Some brands (such as Boardwalk) use anti fingerprint coating on their black models, while white models are often paired with transparent frosted design, depending on the preference for hand feel.
3. Conclusion and Suggestions
Pursuing versatility and dirt resistance, choose black, and focus on refreshing visual effects, choose white.
For those who frequently consume dark colored beverages or are lazy to clean, black is preferred, but for those who have strict hygiene requirements, white is easier to monitor cleanliness.
