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Magnetic Green Viewing Paper

Magnetic Green Viewing Paper is used to show magnetic fields. It shows their location and direction. It is translucent thin flexible sheet, coated with micro-capsules containing nickel flakes suspended in oil. When magnetic lines of force are parallel to the surface of the viewing paper, the surfaces of the flakes are reflective, and appear bright. When lines of force are perpendicular to the sheet, the flakes are edge-on, and appear significantly darker. When the film is placed on the magnet’s pole, the latter case applies and most of the area of the pole appears dark. If two cubical magnets are placed next to each other, poles facing up and down, and arranged to attract each other, their poles are dark, but a thin line between the poles is bright where the flakes reflect light.