1. Fill in 500ml of water and add 15g ( half scoop) of Vanish Oxi Action Crystal White.2. Put 1 pieces of yellowed fabric inside the prepared Vanish solution. Stir the fabric around 20 times , then take out and arrange beside pre treated fabric.3. The fabric should be look whiter ( Arrange it on the black board) Based on visual assessment ,the colour of yellowed fabric ( caused by bleach )turn whiter every 2 minutes soaking. Hence, the 5 shades whiter claim can be substained for in-store demo and TVC of Crystal White Powder.