Transparent Reflection Support in Cycles--a "Reflection Catcher" of sorts — Right-Click Select
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rendering - Creating glass material - Glass shader or Principled give black/dark or mirror render in Cycles - Blender Stack Exchange
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Chocofur Chocofur 10 Glass Advanced Shader - Free Blender and Cycles Advanced Glass Shader created by Chocofur! Improve your interior visualization renderings using our Cycles shaders and textures.
transparency - Blender Cycles - Can't see Glass through Glass - Blender Stack Exchange