1. Definition
Brouillage is a watchmaking decoration obtained by lightly filing the surface. The horologist (watchmaker) continuously rotates the axis of the file during the operation. The lines left by previous steps fade and cross each other. The resulting surface becomes softer, with an appearance that is both matte and slightly shiny.
2. An intermediate step
Brouillage is often used as preparation before other finishes. It erases the machining or filing marks left by the manufacturing of the component. This smoothed surface facilitates and speeds up subsequent operations, such as satin finish or polishing.
3. A final state
Brouillage can also constitute a finish in its own right, without additional decoration. This is notably the case under bridges, which are rarely decorated otherwise. This finish then guarantees the flatness of the surface, an essential condition for good support of the component on the main plate.
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