Rainbow Brush Intro Pack The world's first patented color blending markers can clip together and be squeezed to blend colors and create rainbow effects. Learn RainbowBrush techniques to create amazing lettering and designs including flowers, butterflies, and fish. Let your imagination go wild with RainbowBrush. Included with each book are five of our patented, innovative RainbowBrush markers. Use them one at a time for single colors, or connect two, three, or more together for perfect rainbow art in a single stroke. Included: 5 patented, innovative RainbowBrush markers and an instructional DVD.