Thursday, May 16, 2013

Terahertz Technology: Terahertz Image Reveals Goya’s Hidden Signature in...

Terahertz Technology: Terahertz Image Reveals Goya’s Hidden Signature in...: http://www.technologyreview.com/view/514976/terahertz-image-reveals-goyas-hidden-signature-in-old-master-painting/ Darkened varnish obscure...

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