Discussion
The following method is nondestructive technique for ink identification :
Answer: D
Videospectral analysis examines the ink with light of different wavelengths without altering the document, so it is nondestructive. Solubility tests and thin layer chromatography need a sample of the ink to be removed from the paper, and UV-Vis spectrophotometry as normally applied needs the ink dissolved in a solvent, so these destroy part of the writing. The videospectral comparator is therefore the answer.
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