All four styles of wall painting were developed prior to the eruption of Mount Vesuvius in 79 AD. Although many examples of Roman wall painting were able to be preserved from the eruption, no new styles of wall painting developed after the incident. People continue to decorate their homes with these paintings, but there were never any new styles that developed; instead, a combination of the four styles was used among painters. Improvements were made to the techniques such as a sheet of lead being added to the base of the wall in order to prevent moisture from destroying the art and using a marble powder to produce a shinier surface.