Basically, coagulation is a process of addition of coagulant to destabilize a stabilized charged particle. The venom has both coagulant and anticoagulant effects. Coagulation can be achieved by a chemical coagulant or by electrical methods. The calcium sulfate hydrates are used as a coagulant in products such as tofu. This prevents the formation of the active form of prothrombin and several other coagulant enzymes. Solutions are used in dyeing as a mordant, and as a coagulant for industrial wastes. Calcium nitrate is a very common coagulant in latex production, especially in dipping processes. It is used in cosmetics as an antiperspirant and as a coagulant in water purification. PolyDADMAC is used as a coagulant in water purification. In China, aconitine is also used in small doses as an analgesic and blood coagulant. It may also be used as a coagulant for making tofu. An automated device for determining the coagulant dose is the Streaming Current Detector (SCD). Bittern (nigari) was the first coagulant used to make tofu. In many rodents and bats, the prostatic fluid contains a coagulant. The dose of the coagulant to be used can be determined via the jar test.