Iron corrosion; anti-fouling and anti-corrosive paints . ch, by increasing in thickness,become rust warts. The thickness of the layers variesaccording to the kind and duration of the rust-forming in-fluences at work, often attaining to the dimensions of amillimetre (t;.^ inch) or more, and frequently manifestinga tendency to peel ofl as already mentioned. This peelingoccurs in thin as well as in thick layers of rust, and appearsto be independent of any definite condition of thickness. IRON-COEROSION AND ANTI-COREOSIVE PAINTS. 51 The colour of rust is somewhat variable, being mostly arather bri
Iron corrosion; anti-fouling and anti-corrosive paints . ch, by increasing in thickness,become rust warts. The thickness of the layers variesaccording to the kind and duration of the rust-forming in-fluences at work, often attaining to the dimensions of amillimetre (t;.^ inch) or more, and frequently manifestinga tendency to peel ofl as already mentioned. This peelingoccurs in thin as well as in thick layers of rust, and appearsto be independent of any definite condition of thickness. IRON-COEROSION AND ANTI-COREOSIVE PAINTS. 51 The colour of rust is somewhat variable, being mostly arather bright yellowish red when newly formed, and passing,with age and increasing thickness, into dark red-brown andeven blackish brown, though paler patches may still appearamid the dark layers. Very old rust is mostly blackish brownand exhibits a more or less lustrous, almost crystalline ap-pearance. When converted into powder the colour of rustis bright yellow-red, like that of the fresh product and thenatural oxides of iron. Owing to the porous character of. Fig. 36 (natural size).—Rolled sheet iron with apparently uninjured development of rust occurred after exposure to concentrated hydro-chloric acid for five minutes. rust it readily absorbs water and considerably retards theevaporation of that liquid. It also easily takes up fattysubstances, and these, on passing into the interior of themass of rust, s-often it and facilitate its removal by similar effect is produced by petroleum, and it is on thisproperty that the method of cleaning rusty iron by moisten-ing it with petroleum, and then scrubbing with sharp sand,pumice, glass paper or emery paper, is based. 52 mON-CORROSION AND ANTI-COBROSIVE PAINTS. Having now become acquainted with the circumstancesunder which rust is produced, and also recognised its in-jurious effect on iron, we turn to the question, How canrusting be prevented, and what means should be employedto this end ? In principle one might repl
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