Caution: three main points are important. The water used in making paste should be good quality mineral water. Temperature of water should be between 15 to 20 degree. It increases the setting time as well as the efficacy on open pores and inflamed skin. The water quantity should be just enough to make smooth non flowing paste. Too much water will drip down and also increase he setting time. Less of water will make powder set too fast to apply it properly.