This composition is executed on cream wove writing paper. Faint graphite pencil drawing is evident, followed by pale blue watercolour wash applied to depict all details. For example, the effect of the mortar has been created by leaving areas of blank paper visible. Indigo is the only pigment used.
					
						Helen Evans
						October 2008
					
						Revised by Joyce Townsend 
						February 2011
					
				 
				
				
					
How to cite
					Helen Evans, 'Technique and Condition', October 2008, revised by Joyce Townsend, February 2011, in Andrew Wilton, ‘Part of Petworth Church, Sussex, Seen from the North-West 1792 by Joseph Mallord William Turner’, catalogue entry, April 2012, in David Blayney Brown (ed.), J.M.W. Turner: Sketchbooks, Drawings and Watercolours, Tate Research Publication, December 2012, https://www.tate.org.uk/art/research-publications/jmw-turner/joseph-mallord-william-turner-part-of-petworth-church-sussex-seen-from-the-north-west-r1140294, accessed 31 October 2025.