Phase diagrams of pseudoternary mixtures of emulsifier (tween-80 and iso-am
yl alcohol), hexane and water have been constructed with varying surfactant
cosurfactant ratio. Transparent and translucent domains have been identifi
ed in the phase diagram by visual titration method. The viscometry and elec
trical conductance studies of the microemulsion demarcate the oil in water,
bicontinuous and water in oil phases.