REVELLERS relieving themselves on Pamplona’s medieval walls during this week’s famous San Fermin festival are in for a shock.Pamplona fights festival urine

Scientists have created an invisible water-resistant paint which repels urine back onto the offender’s trousers and shoes.

Street urination among festival goers has been a recurring problem causing damage to the walls and costing an estimated €10,000 to clean up.

Last year 76 people were fined by police for urinating in public.

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