Question

which of the following can be removed by using light at various wavelengths shined behind the document? differences in ink composition erased ink presence of chemical erasure obliterations

Explanation:

Obliterations (like overwriting or covering text) can be examined by shining light of various wavelengths behind the document. This technique helps reveal the underlying text as different inks or materials interact with light differently. Differences in ink composition are analyzed via chemical or spectral methods (not just backlighting), erased ink is often studied with chemical or microscopic means, and chemical erasure detection is more about chemical analysis. So the method of using light behind the document is effective for detecting/removing the appearance of obliterations to reveal underlying content.

Answer:

D. Obliterations