In the documentary The Secret of Drawing, a surgeon dips forceps in the blood of a patient on the operating table to sketch a procedure.
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The full 'dip pen' sequence (not for the squeamish) can be seen on Vimeo .)
The surgeon, Francis Wells (left), on the shading qualities of blood:
"It is actually a wonderful medium to draw in because in cardiac surgery you dilute the blood and you can have blood that’s pure blood or blood that is slightly diluted. And as one knows with people like Turner and so forth, he used different strengths of media, you can actually use different strengths of blood, and it really does produce some wonderful pictures."
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