DANIEL SMITH Watercolour - 15mL - Duochrome TurquoiseDuochrome Turquoise shifts between a vibrant Caribbean blue and a sparkling sea green. Why Luminescent Watercolors? Nature has optical surprises in the colours that you see in birds feathers, insects, fish, and seashells, many flowers also have a pearly, dewy sheen to them. Consider the iridescence of a snails trail or a silvery spiders web. Other things that also have a sparkle, or glow depending on the light, a silvery or golden moon, clouds aglow