article_snippet.sent: The graph shows a clear trend toward more blue paintings toward the end of the 20th Century, with all colours increasing except for orange. '
article_snippet.sent: One of these could of course be trends in the use of colour. '
article_snippet.sent: For example the marked increase of blue at the time of the First World War, might actually reflect a true trend in colour use.'
article_snippet.sent: He believes that some experts who have claimed perhaps the change is due top the price of paint are wrong. '
article_snippet.sent: I haven’t found any data on the prices of blue, so that explanation is hard to elaborate on. '
article_snippet.sent: However, it is not only blue that increases but all colors except orange, which might speak against the pigment prices explanation. '
highlights_snippet.sent: In recent years blue has begun to catch up - and nobody is sure why .