Last October, scientists announced the creation of ultra-white paint so reflective it could be used to keep surfaces and even entire buildings cool. That breakthrough really pushed the envelope on new ways to fight global warming. Now, they've produced an even whiter paint. The ultra-white paints are considered the opposite of vantablack, which absorbs 99.9 percent of light. They reflect so much light that a surface painted with them actually ends up being cooler than the ambient temperature around them. The paint revealed in October was based on calcium carbonate (CaCO3), the mineral that makes chalk. It had a reflectance of about 95.5 percent, meaning that less than 5 percent of sunlight hitting it would be absorbed as heat.