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By Matthew Nighswander

When Indian Prime Minister shook hands Tuesday with Britain's Prince William, he made quite an impression. As seen above, the ghostly outlines of his vice-like grip are clearly visible on William's red hand after the encounter.

Perhaps William had heard rumors about Modi's strong clench because as he stares at Modi's open hand in the picture below, he seems to hesitate.

Britain's Prince William prepares to shake hands with India's Prime Minister Narendra Modi as Catherine, Duchess of Cambridge, looks on at Hyderabad House in New Delhi on April 12.ALTAF HUSSAIN / Reuters

During the actual handshake, William maintains the famous British stiff upper lip.

Indian prime minister Narendra Modi shakes hands with Britain's Prince William prior to a meeting at Hyderabad House in New Delhi on April 12.HARISH TYAGI / EPA

But, ouch, once his hand is free, we can see the damage.

A strong handshake by Indian Prime Minister Nanrendra Modi leaves an impression Prince William's hand prior to a meeting at Hyderabad House in New Delhi on April 12.HARISH TYAGI / EPA

VIDEO: Prince William learns that India's prime minister has a powerful grip

The Duke and Duchess of Cambridge are on a weeklong tour of India and Bhutan.

On Saturday, they visit the Taj Mahal, where William's mother, the late Princess Diana, was memorably photographed sitting alone on a bench in an image that came to symbolize her unhappy marriage.

Photos: Will and Kate Feed Rhinos, Elephants on Indian Safari