Pro tip: Add the sample to the solution, not the solution to the sample. One slip of a dropper and you've contaminated it and it needs to be thoroughly clean before it's put back in the bottle. By placing your solutions out first, there's no possibility of contaminating the bottles.
Thank you for your observation and comment!🙂 The timing for rocking the tile ideally is 1min for +ve result(but 2mins just to be sure). Although i didn’t, rock it for exactly 1 minute(55 secs), I just wanted to demonstrate the procedure and the main concept in carrying out this test 👌😉
