Magnetic Field Viewer Film — A4 Sheet, Iron Powder Suspension

Magnetic field lines are invisible — until now.

A suspension of fine iron powder in a viscous fluid responds to magnetic fields exactly as Faraday first described, aligning along field lines to make the invisible geometry of magnetism instantly visible. Place any magnet beneath or above the film, watch the field lines appear. Essential for understanding dipole fields, monopole approximations, and the geometry of Maxwell's equations in a concrete, tactile way.

• Size: A4 (21×29.7cm) flexible film
• Iron powder suspension in sealed laminate
• Works with any permanent magnet
• Reusable — field lines reset when magnet removed

Every purchase directly funds independent physics research at the Golden Physics Project.