The Milan stock exchange shed more than 4% shortly after opening Tuesday amid signs that Italy is being affected by the eurozone debt crisis contagion. The benchmark FTSE Mib index dropped to 17,544 points within minutes of opening, after it fell nearly 4% the day before. Bank shares were in freefall, with UniCredit shedding 7.11% to 1.072 euro and Intesa Sanpaolo dropping 6.62% to 1.425 euro.