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TIL Blueprints are blue because the photosensitive chemicals used to make copies of the documents turn blue when exposed to light.

M. Amaar Tahir
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TIL Blueprints are blue because the photosensitive chemicals used to make copies of the documents turn blue when exposed to light. TIL Blueprints are blue because the photosensitive chemicals used to make copies of the documents turn blue when exposed to light. Reviewed by M. Amaar Tahir on 12:07 AM Rating: 5

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