TIL Blueprints are blue because the photosensitive chemicals used to make copies of the documents turn blue when exposed to light.
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Submitted September 30, 2018 at 01:12PM by Kennyk11 https://ift.tt/2QmIDYV
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October 01, 2018 at 01:48AM
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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.
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