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Opal according to its color can be divided into black opal, white opal, yellow opal, and so on, with the highest black opal prices. In order to lower the price of white or yellow opal improve grades, some people use artificial methods to change color and become "black opal" to seek Gregory. The main way is to cook with sugar or injected plastic, black to white opal. Identification method is to cook the sugar or injection of opal significantly different proportions, in water testing, the proportion of the value of its variable light. Heating can also be used after the test injection needles opal, natural opal fever needlestick not into, injection opal can Zhajin and produce plastic Yang of the odour.