You can use these fine iron filings for observing magnetic fields around magnets.
Place a sheet of paper on top of a magnet and sprinkle these on top of the sheet. Your iron filings will get arranged along the magnetic field lines and give you an excellent 2D visual image of the magnetic field.
This affordable 500g bottle of fine iron filings is perfect for classrooms, science labs, and science fair projects.
WARNING: These are not suitable for children under the age of 18 without adult supervision. Fine iron filing can be inhaled and cause lung injury. Always use face masks to protect yourself when using iron filings.
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