|Brief description: || |
The sample, diluted with solvent, is placed across a tilted slide. Beneath this glass strip is a magnet placed level. At the uppermost point of the slide, the magnetic field strength is at its weakest. At the bottom end, the glass strip is almost lying on the magnet, meaning that the field strength is at its strongest here.
If the mixture of oil and solvent is guided over the slide, the large, easily magnetisable iron particles form deposits at the top. The smaller particles require stronger magnetisation and accordingly form deposits further down. The arrangement follows the pattern of the magnetic field lines.