We propose to record "en face" Full Field OCT interferometric images of paintings on canvas using a cooled MCT camera working in the range 3-5.5 micrometers coupled to a glowbar broadband source that allows to reach shot noise limited detection. Penetration in various paints is spectacular at these large wavelengths: we measure a mean free path 5 to 10 times larger than at visible/near IR wavelengths. We find that the canvas is easily observed under the paint. This result, obtained without averaging, paves the way to a non-contact, non-destructive, more detailed analysis of paintings than existing IR techniques.
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