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J. M. W. Turner experimented with the new cobalt blue , and of the twenty colours most used by the Impressionists , twelve were new and synthetic colours , including cobalt blue , ultramarine and cerulean blue .
 J. M. W. Turner, Impressionists
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 J. M. W. Turner, Impressionists