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Old-written material, which cannot be read easily, can be
read by

1 Cosmic rays

2 Ultraviolet rays

3 Infra red rays

4 None of these



Old-written material, which cannot be read easily, can be read by 1 Cosmic rays 2 Ultraviolet..

Answer / guest

(3) Infra red rays

Is This Answer Correct ?    74 Yes 7 No

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