Equally revealing is this recently discovered first draft of Guido Reni’s Ecce Homo.

Equally revealing is this recently discovered first draft of Guido Reni’s Ecce Homo.

The Shroud of Turin-liciousness.

The Shroud of Turin-liciousness.

This phenomenon does not appear to be limited to Renaissance paintings.  Here is El Greco’s “Christ Carrying the Cross” using the same re-imaging technology.

This phenomenon does not appear to be limited to Renaissance paintings.  Here is El Greco’s “Christ Carrying the Cross” using the same re-imaging technology.

A similar technique was applied to Raphael’s “The Transfiguration.”

A similar technique was applied to Raphael’s “The Transfiguration.”

A new technique called “synchrotron radiation induced X-ray fluorescence spectroscopy” has revealed this secondary image underneath Da Vinci’s “The Last Supper.”

A new technique called “synchrotron radiation induced X-ray fluorescence spectroscopy” has revealed this secondary image underneath Da Vinci’s “The Last Supper.”