The Council of the technological plan. For mounting front panels of enclosures of different radiokonstruktor often used galvanized, blue and all shiny screws or bolts, not impressive looking on a dark background. I head saharnau: cleaned with sandpaper “nulevkoy”, degreased cotton swab soaked in Cologne, is heated in the flame of a gas burner until red-hot, dipped in vegetable oil and slowly cooled in air. As a result, the head gets black finishing and is corrosion-resistant. Interestingly, if you use mineral engine oil, the surface is lighter, matte. E. SAWICKI, Korosten
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