Infrared reflectography is a non-destructive imaging technique used primarily in the field of art conservation and analysis. It employs infrared light to penetrate the surface layers of a painting, allowing experts to see underlying sketches, changes, or underdrawings that are not visible to the naked eye. This method helps in understanding the artist's process and intentions. The technique works because certain pigments and materials used in artworks are transparent to infrared light. By capturing the reflected infrared images, conservators and researchers can gain insights into the composition and history of a piece, aiding in restoration efforts and authenticity verification.