2.3.5. Sinkability
In this test, 3.5 ml of distilled water at 20 °C was taken in the spectrophotometer cuvette and 10 mg sample of powder was then dusted on the surface of water and the percentage transmittance was measured at 760 nm in a spectrophotometer. The readings were recorded
after 2, 4 and 6 min intervals. The mean of three replicate values was taken as the percentage transmittance