Phthalo Green is an almost fluorescent green color. Because of its transparent quality, it can be used atop Black Gesso to create gorgeous effects, including those found in Bobí_í_Œés í_í_íånorthern lightsí_í_Œ paintings. One of fourteen warm clean colors, yielding endless numbers of natural combinations in a smooth yet firm consistency necessary to the Bob Ross Wet-on-Wet TechniqueŒëŒå. No other paints can accomplish what these do, and every batch is individually tested for perfection.