Vegetable oil makes Pyrex glass disappear because both materials bend light in the same way, with a refractive index of 1.47. https://t.co/SqIlBRGFMo https://video.twimg.com/ext_tw_video/1832689319716237312/pu/vid/avc1/650x694/Z4fvThsEL6bt5vKk.mp4?tag=12