Insulator sky light for dark insullators $10 each plus shipping. Shown is one of the "skylights" that I had manufactured 5 to 10 years ago to display dark insulators better. They work the best with direct or indirect sunlight from a window. The skylights actually do better bring out the colors to the naked eye, but work best when the sun is high in the sky in the exposure you are facing. the insulator shown IS NOT included with the skylight. $10 each plus shipping. I have 7 or 8 of these left. There is a protective film (for scratching) that needs to be removed from the mirror when you get them. These cost me about $13 each to have made; but, I have a lack of window sills in my current house.