Research on Material Colour and Soak-induced Colour of Unearthed Ancient Jade

It is an important content in the identification research on the ancient jade wares through study the colour of the wares.The colour of the unearthed ancient jade ware is caused by the factors:(1)the colour of itself,which is called the material colour of jade by the author.It is determined by the components and the content of the colour-causing elements in the jade;(2)the colour of some jades which are fashioned into the jade articles are buried in soil and then they act with the medium around.So it is called soak-induced colour.In the identification practice,the colours of the jade materials are mistaken to soak-induced colour.The Hetian jade is taken for an example in the article to identify the material colour and soak-induced colour through the relationship between the colour and the carved grains on jade.