The French have made the biggest cyanotype in the world. Vincent Martin and Michel Miguet organised 26 people into a pattern on a huge cyanotype coated cotton cloth to take out the record at the Festival Art et Science at the Festival d’Avignon, July 11, 2013.
The project used 46m2 of fabric and 14 litres of cyanotype solution. Exposure time was 10 minutes.
Check out their website for some pics of the process on http://photomavi.com/expo/perfcyanotype.htm