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The decomposition of some iron‐silicon alloys at low temperatures is influenced by spontaneous magnetization in each ferromagnetic domain. The anisotropic decomposition structure is frozen in by cooling and in this way a spatial replica of magnetic domain structure is produced, which was present in the sample at the time of ageing (at a temperature of about 600 °C). It is then revealed at room temperature on any cut through a bulk specimen. All 90 and 180° domain walls are clearly visible. Spatial reconstruction of the internal magnetic domain structure was performed by successive polishing and etching. By the same method the interaction of domain walls with dislocation networks was observed.

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