What type of lead testing can reveal lead sources in multiple layers of paint?

Laboratory analysis of paint chips is the correct choice because this method involves taking samples from the paint layers and sending them to a laboratory for detailed analysis. The analysis can determine the lead content in each layer of paint, thereby revealing the presence of lead in multiple layers. This is particularly useful in older buildings where lead-based paints might have been applied over the years, allowing inspectors to understand the history of lead exposure in the structure.

Other methods, while useful in their respective contexts, do not provide the same depth of information about multiple layers of paint. Surface wipe testing, for example, measures lead dust and is effective for assessing potential exposure risks but does not give information about the lead content in the paint layers themselves. In-situ lead analysis typically involves non-destructive testing methods to evaluate current layers but may not differentiate between multiple paint layers effectively. Visual inspection methods can identify the presence of deteriorating paint but cannot quantify lead levels without further testing. Therefore, the ability of laboratory paint chip analysis to assess each layer distinctly makes it the most suitable option for revealing lead sources in multiple paint layers.