Experts use sponges, seaweed, and science to conserve Maxo Vanka's historic murals at St. Nicholas Church, revealing lost ...

How do you conserve 80-year-old murals that have accumulated decades' worth of soot, salt and other deterioration? Slowly and ...

The walls and ceiling of the church are covered ... and thin cotton swabs to clean surfaces and grooves. Much of the grime, they surmise, resulted from day-to-day atmospheric pollution, ranging ...