>Point 3 goes against normal behavior of hot metals, which emit infrared or visible light as they get hotter. You're right. People refer to it as 'transparent'

>Point 3 goes against normal behavior of hot metals, which emit infrared or visible light as they get hotter. You're right. People refer to it as 'transparent' because it begins to glow the same color as the jet plume under afterburner use. https://gizmodo.com/this-is-an-image-of-the-very-last-test-of-the-pratt-w-1484943138 https://gizmodo.com/this-is-an-image-of-the-very-last-test-o...