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Sulphonic Acid, (C6H4(SO3H)(CS2)10CS3) is also called LABSA (Linear Alkyl Benzene Sulfonate Acid). LABSA is a very strong chemical agent that deals with the deepest of dirt on fabrics. It is a very thick and clear agent which comes in either clear light brown or thick dark brown color. In soap making, people consider LABSA as a foaming agent. Of course, it is the major foaming agent in whose absence, soap may lack its lathering abilities to foam as desired. But prior to LABSA lathering abilities, LABSA is first a stain remover agent. It is a very strong agent that should never touch the skin for any reason.