Infrared imaging is a technique used in painting examinations that records the variation in absorption reflection and the transmission of IR radiation by an object revealing features that are otherwise not visible to the human eye. Look right round a selection of sculptures in our Collection, Explore who is who in our group portraits, National Portrait Gallery, St Martin's Place, London, WC2H 0HESwitchboard: +44 (0) 20 7306 0055, Find out more about the Inspiring People project, National Portrait Gallery, St Martin's Place, London, WC2H 0HE (130 mm x 80 mm) plate size; 7 1/2 in. Find out more > Use this image; Queen Elizabeth II.

It is open Wednesday to Sunday, 11:30 a.m.–7 p.m.

Spotted an error, information that is missing (a sitter’s life dates, occupation or family relationships, or a date of portrait for example) or do you know anything that we don't know?

Forty-two x-ray images were taken of the Lansdowne and stitched together into a final overall image. Sometimes we have not recorded the date of a portrait. Their Privacy Policy & Terms of Use apply to your use of this service.

Ultraviolet (UV)-induced visible fluorescence (UV/Vis). Connect with the museum at, Facebook; Instagram; Twitter and YouTube.

Digital imaging of the portrait was completed using ultraviolet-induced visible fluorescence, infrared reflectography and digital x-radiography. The painting will be off view for a period of 18 months.

X-radiography has been a standard technique to document and assess the condition and construction of a painting. If you tick permission to publish your name will appear above your contribution on our website. Contributions are moderated.

x 6 in.

(228 mm x 151 mm) plate size; 9 3/4 in. The National Portrait Gallery will be open Wednesdays through Sundays 11:30 a.m.–7 p.m. beginning Sept. 18 at Eighth and G streets N.W. Ingamells, John, National Portrait Gallery: Mid-Georgian Portraits 1760-1790, 2004, p. 309; Saywell, David; Simon, Jacob, Complete Illustrated Catalogue, 2004, p. 364.

Infrared light analysis, which can penetrate the top layers of the painting, is helpful in identifying the presence of underdrawing. Henry Petty-Fitzmaurice, 3rd Marquess of Lansdowne. If they inspire you please support our work.

x 3 1/8 in.

The National Portrait Gallery will be open Wednesdays through Sundays 11:30 a.m.–7 p.m. beginning Sept. 18 at Eighth and G streets N.W. Share Icon.

Sitter back to top.

See the full schedule of our exhibitions, performances, programs and tours. In order to understand Stuart’s materials and working processes, as well as establish a treatment strategy, CindyLou Molnar, Head of Portrait Gallery Conservation embarked on an 18-month project in collaboration with E. Keats Webb, Digital Imaging Specialist at the Smithsonian’s Museum Conservation Institute (MCI).

x 4 in.

Information obtained from the analysis led to a successful cleaning that revealed the artist’s original intent. The Smithsonian’s National Portrait Gallery tells the multifaceted story of the United States through the individuals who have shaped American culture.

The painting which had been on loan to the gallery since 1968 until its acquisition in 2001, presented some conservation issues which needed to be addressed. The full-length 1796 “Lansdowne” portrait of George Washington by Gilbert Stuart is a national treasure and is considered Stuart’s American masterpiece. The Lansdowne has been on view since the museum opened in 1968; it was on long-term loan before the Portrait Gallery acquired the portrait in 2001 through the generosity of the Donald W. Reynolds Foundation. Can you tell us more about this portrait? If you require information from us, please use our Archive enquiry service. published by Lansdowne Production Co bromide postcard print, 1952-1953 NPG x193025. Prices start at £6 for unframed prints, £25 for framed prints.

George Granville, Baron Lansdowne. Different painting materials exhibit characteristic fluorescence or absorbance when exposed to ultraviolet light, helping to determine different types of varnish and identify areas of retouching.

The painting will be off view for a …

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