it is a temperature-sensitive powder.
When we produce plastic cups ,we added changing powder material into the plastic material, The temperature of the powder determines the temperature of the color change. At present, in the market, there are hot and cold color changing, Their color change must reach to a certain temperature. For example ,45 degree ,22 degree,18 degree ,15 degree.
And indoor temperature directly affects the effect of the color changing cup. That seems hard to understand. Let me show you now.
Now the cup original color is yellow. Now I am pouring cold water and ice into the bottle ,Let the temperature of the cup drop until it can change color. But because it's summer and indoor temperature has reach 30 degree, so the cup cannot feel lowwww temperature itself.
So even if we pour ice and ice water in, the temperature of the whole cup doesn't change much.so If you want perfect effect, please set the room temperature under 25 degrees, higher 15 degree.
If higher 25 degree, maybe we need more ice;
If lower 15 degree, the cup cannot keep original color.
My body temperature is 36 degree. So when I touch the cup. It will Reback to the original color