Medium crystal arrived broken at one end. Since there was no piece of glass in the box, it was packed like this. However, most prisms have space to hold the prism. So I just keep a prism for this purpose. No problem. We remind you that optical crystals are very fragile. Not durable at all. Notice of Use. Crystal prisms do not work well under low-level artificial lighting (fluorescent, incandescent, LED). You must place them in bright white light or in direct sunlight to see the rainbow. Second, you have to bounce it off the white wall. The rest of the Prism is not very good. This is not the quality of the prism but the nature of the light passing through the crystal. With these limitations, these prisms are suitable for adult toys. They're not very useful for a camera picture or anything like that. I use them to try and replicate Newton's color mixing experiments. A difficult experiment to repeat. These prisms cannot be used to measure accurately, so they are not experimental devices. However, the price is okay for a hobby like mine. I succeeded in a combined color mixture.
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