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For decades, local factories smelted zinc, produced phosphate fertilizer, and manufactured lithopone paint pigment.

The police have also arrested six people at the Hongquan Lithopone Factory and the Jinhe Mining Company, which are blamed for the spill.

Almost complete failure had taken place in every case where lithopone had been used.

These lithopone tests were later on replaced by new tests which are described later in this book.

Unfortunately this zinc chromate was added to a formula containing a large percentage of lithopone, and the destruction of the lithopone to a great extent affected the value of this test.