5 ball-tampering techniques that cricketers often get away with
#4 Using mint saliva on the ball
Another method employed by the fielding side to gain an undue advantage is to chew a mint gum and then use the saliva to shine one side of the ball to make it heavier thus creating a bias between the sides.
Often the ball moves in the direction of the heavier side and when mint is mixed with the saliva, it sticks around for a longer time which helps the bowlers generate prodigious swing.
Former England opener, Marcus Trescothick revealed in his book post-retirement that this particular method was widely used to keep up the shine on one side of the seam.