Instead, folium is an entirely new class of dyes. The researchers learned that folium isn't a dye similar to those extracted from other blue flowers and fruits. The secret to this fruit’s mysterious blue color. And it's not like indigo dye. By Food & Wine. Consequently, many weight-loss experts have advised clients to eat off blue plates or install a blue … Updated May 09, 2017 Skip gallery slides. By Charlotte Hartley Aug. 6, 2020 , 11:00 AM. The metallic blue shade has an unusual origin. Scientists have found that the color blue is actually an appetite suppressant. Blue foods are a rarity in nature; only a handful of blue fruits and vegetables grow across the globe. You can also observe in the background of the video, except the one blue (painted) apple, all other fruits on tree are natural in color. More. Blue fruits are obviously blueberries. View All Start Slideshow. You can see the painted signs in some pictures from the video. Save FB Tweet. 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