from The Washington Times
Art as a chemistry project
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A brief and cursory look at scientific research at the Conservation Department of the National Art Gallery in Washington, DC. An interesting estimate mentioned in the article, quoting Ross Merrill, the chief of conservation:

"Someone once asked how long it took to analyze a painting, and the answer was about three times as long as it took the artist to do it."

No wonder we suffer from a lack of such interesting research in today's fast-paced world! Also, towards the end of the article, there is a mention of the use of glass in Venetian paintings reported earlier.