Review on Optical Spectrum Physics Teaching Novelty & Gag Toys by Tim Rushing

This would be perfect for class demos but I was looking for a working demo part and mine arrived with a major defect. It looks like it will like a corner was chipped off at the factory and in trying to polish it they removed most of one of the corners.There are no sharp edges here and were it not for a jagged corner this would be a perfect piece of glass.