Hello, I am a molten salt researcher and my reactors run at ~1050 C. I can't look inside my reactor as it operates sealed, but I am attempting to differentiate metal droplets that may be floating on the surface from the molten salt using viewing ports, or briefly opening it up and using mirrors to observe from a distance.

The inside of my reactors glow orange at this temperature and as of now, even with them opened up, it is difficult to know if I am looking at anything interesting as they are bright. I hope to provide contrast and make it easier to see if anything is changing at the liquid surface.

Ideas I have:

Two opposing viewing ports, at an angle, cut into the sealed reactor so that I can observe the surface of the liquid. One port will have a light source shining into the reactor, and the other is a viewing port where I intend to filter out different colors of light using colored glass, and reduce the total amount of light coming through to enhance contrast.…