Chinese cork and the Portuguese cork were used as sample to make heat treatment. In order to find the influence laws of heat treatment on the cork color, the temperature rose to 180, 200, 220 ℃ and the time was kept for 1, 2 and 3 hours respectively. The results show as follows： The color of the treated cork changed obviously by the heat treatment. Under the same temperature, the color saturation became bigger and the color difference became more obvious with the increase of the keeping time. Lightness decreased with an increase of the keepin...
