Is lead paint bad?

know that Maroger and other mediums do not betray their bad characteristics for a long time. (60 years is not enough time - oil paint isn't even fully dry in 60 -80 years on a typical thickly painted painting) Maroger (1884-1962) did not influence artists until the early 20th century so 19th century works are not affected by his practices. However, recently, two conservators in a museum in New England examined and studied the work of John Stuart Curry who was an avid fan of Maroger. Many of his works have suffered through the use of the medium. Granted, Curry was a zealot who followed Maroger's early and late formulations. Curry's work employed an early Maroger formula that involved leaded oil, resin and in early versions incorporated water based additives. These have suffered the most.