The X-ray technology is a filming technology which primarily captures and records the density and compositional structure by penetrating the beams through an object.
The paintings can be X-rayed and it can disclose about the components which are not visible because they are beneath a painting. It can also tell us whether a painting is original or a copy.
The X-ray uses the density of pigments , components and strokes made while painting to determine the outcome.
Therefore the statement that "X-rays of paintings can reveal under-drawings and marks made on the canvas prior to the finished work" is TRUE.
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