2.3.4. Wettability
A piece of satin-fabric measuring 10×10 cm was stretched over one end of the metallic can (open at both ends with 6.5 cm dia and 4.5 cm height) and fastened in position by a rubber band. Another one end can (5 cm dia and 7 cm height) was placed centrally on the cloth. The tray was filled with distilled water at 40±1 °C to a height of 2.5 cm. A triangle made out of 0.4 cm thick glass rod with sides measuring 8 cm long was placed in the dish and served to prevent close contact of the cloth with the bottom of the dish. With the two cans assembled, and cloth resting on outer can, 1 g of powder was transferred to the inner can and spread over the 6 cm circle of the cloth as evenly as possible with a soft sable hair brush. The inner can was then removed and the outer can lowered into the tray onto the glass triangle and held in place, until the water level in the can ceased to rise. A stopwatchwas clicked as soon as the cloth touched the water and stopped when the powder got completely wet. The time taken for complete wetting of powder was recorded in seconds.