Final answer:
Plastic prints must be dusted or treated to identify the ridge patterns. The statement is true.
Step-by-step explanation:
The statement is True. When plastic prints are examined as part of a forensic investigation, they often need to be dusted or treated to enhance their visibility. This is done to identify and analyze the ridge patterns present on the plastic, which can be unique to each individual. The statement that plastic prints must be dusted or treated to identify the reg patterns suggests that this process is necessary to visualize and record the patterns present on plastics. This relates to techniques used in forensic science to collect and analyze fingerprints that may not be readily visible on plastic surfaces. In the context of thin-film interference, which is a concept within physics, you would indeed expect to see a pattern to the colors due to variations in film thickness causing constructive and destructive interference at different points. To make a permanent record of such observations, one may take a photograph or use other imaging techniques that capture the interference pattern for subsequent analysis.