In some cases, underdrawing can be clearly visualized using infrared reflectography because carbon black pigments absorb infrared light, whereas opaque pigments such as lead white are transparent with infrared light.
What is remarkable about some historical examples of underdrawing, in - for example - the Annunciation (van Eyck, Washington) or the Arnolfini Portrait, is the extent to which artists made radical alterations to their carefully laid designs.
Wipo Publishes Patent of Japan Tobacco, Makoto Sendo, Kurodo Harada and Toshihiko Gunji for "Sliding Box-Type Package" (Japanese Inventors)
Aug 09, 2013; GENEVA, Aug. 9 -- Publication No. WO/2013/114521 was published on Aug. 8.Title of the invention: "SLIDING BOX-TYPE...