... color changing Add cold water, the picture outside will magic change ON temperature; 8°C,12°C,15°C,22°CColor changing glass, Glass ... for cold changing color changing shows:Just a mug with fower printing at room temperature . But ,when pouring cold water inside the ... the mug.2. Material of glass: is best effect for color changing3. We have different temperature color changing oil, Such as 8°C ...