correct types, and the amounts of raw materials at specified times by using computer controls. This process consists of 3 methods: firstly, compounding the batch; secondly, quality control check; and thirdly, filling and packing.

In the first phase, water is filled into the main batch tank. The suspending agents and some of the ingredients are added in this phase. Mixing is implemented at low rate for adequate dispersion. During mixing no air is added. In the second phase, a suitable amount of pigment is added into the water. Mixing is