This flat black glass is completely opaque, no light passes through at all.
#190 Black Opal purchased prior to November 16, 2016 is from a different manufacturer. The previous manufacturer has gone out of business, but we worked hard to find the closest match in quality and appearance. The main difference between tiles from the old vs new manufacturers is on the back side. There's a slightly rough texture on the tiles purchased after Nov 16. The important side, the surface, is smooth and shiny like the old glass. If placed side-by-side with the old glass, you may notice it's slightly more reflective than the old glass, but the difference is minimal, and the new glass is absolutely beautiful!