Use specific words red and blue , says Waterhouse, not general ones brightly coloured.

http://forshaga.instructure.com/eportfolios/571/GP_T3_25_Mcg_Best
http://esu8.instructure.com/eportfolios/3117/Fenered_1_Mg_Gold

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Artificial Intelligence Is Now Shockingly Good at Sounding Human.