南特附近的卢瓦尔河驳船

From the second half of the 1820s, Turner began to use small pieces of blue paper as a support, both for his finished designs intended for engraving , and for the purpose of making informal sketches. The strong colour of the blue paper proved especially suitable for sky studies, such as those Turner made while exploring the rivers of Europe, and in the park at Petworth in West Sussex.