Both are the result of profound concern over the effects of lead as a contaminant in domestic and environmental situations. Lead's virtues turn out to be its dangers, too. Classified as a heavy metal, lead is virtually indestructible, making it a desirable component in paint, especially where use and abuse may be high. And once ingested, lead leaves the body slowly. A pattern of ingestion can result in a bloodstream build-up, quickly causing a form of poisoning.
Similar dangers exist in certain ceramic finishes also containing lead.
The fear of contamination regarding these structures is largely environmental. On the other side are the residential units containing lead paint. The authorities are gradually looking at other areas of residential contamination. Steel structure work has been under way for some time now, and the field is dominated by large-scale technology and environmental regulation. Removal is accomplished primarily by some form of pressurized abrasive, with containment a major concern.