In a continuous scouring operation, a desized fabric (with 40% wet expression) is dipped into a saturator (alkali bath). After saturation the wet expression becomes 100%. The required alkali concentration (w/v) of liquor present in the fabric exiting the saturator is 6%. Considering no liquor interchange in the saturator, the alkali concentration (w/v) in the saturator (in integer) is \underline{\hspace{2cm}.}