Two kinds of effective colour modifying technology have been attained by adjusting a series of parameters:(1) the technology of partial step up pressure and high temperature heat treatment;
通过改变和调整条件参数后，得到两种效果较好的改色工艺：（1 ）局部增压高温加热法改色工艺；
Two kinds of effective colour modifying technology have been attained by adjusting a series of parameters:(1) the technology of partial step up pressure and high temperature heat treatment;
通过改变和调整条件参数后，得到两种效果较好的改色工艺：（1 ）局部增压高温加热法改色工艺；
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