Ball-Tampering: The Physics

Any artificial alteration of the ball's surface — lifting the seam, scratching with grit/sandpaper, applying a foreign substance — banned under Law 41.3.

The cricket ball's cork-and-leather construction dates to the 1770s (Duke's of Kent); pink and white balls were introduced later for day-night and limited-overs cricket.

Roughening one side accelerates reverse-swing onset by 10-15 overs; the temptation is real but the punishment (suspension, 5-run penalty, ball change) is severe.

Legal alternatives — bouncing the ball into the rough side of the square, throwing on one side only — are coached at junior level.

Bowlers learning the line between care and tampering; team management briefings before each tour.