MUTTENZ, Switzerland — Clariant International Ltd. and Zhejiang Baihe Chemical Holding Group have announced the expansion of the Hangzhou Baihe Clariant Pigments Co., Ltd. joint venture by investing in a world-scale plant for the production of Quinacridone specialty organic pigments. The new plant will be built at the existing joint venture facility located in Hang Zhou City, Zhejiang Province, China.