treat this mud with 1% (w/v) of the potassium lignosulphonate (KLS) and adjust pH in the range 10-10.5 with 4N KOH solution and stir for 10 minutes with Hamilton Beach Mixer at high speed and divide this mud into 02 partsRecord apparent viscosity and yield point of 1st portionYield point should not exceed 25% of the value obtained for KCL base mud as at 1(a)