Iron corrosion; anti-fouling and anti-corrosive paints . nsand by an actual surrender of oxygen. Practice confirms this [and also that Mulder startedwith the erroneous assumption that the pigment, to be good,must necessarily exert a drying action]. When boiled oil,whether alone or mixed up as paint along with some neutralsubstance like iron oxide, zinc oxide, etc., is left or keptin an open vessel, a skin forms on the surface. With whitelead or litharge this skin forms sooner and attains a greaterthickness; red lead paint sets to a thick mass in the vessel;and, whilst putty made solely from ch
Iron corrosion; anti-fouling and anti-corrosive paints . nsand by an actual surrender of oxygen. Practice confirms this [and also that Mulder startedwith the erroneous assumption that the pigment, to be good,must necessarily exert a drying action]. When boiled oil,whether alone or mixed up as paint along with some neutralsubstance like iron oxide, zinc oxide, etc., is left or keptin an open vessel, a skin forms on the surface. With whitelead or litharge this skin forms sooner and attains a greaterthickness; red lead paint sets to a thick mass in the vessel;and, whilst putty made solely from chalk does not becomehard even after several months, it very soon hardens if whitelead be present, and white lead putty quickly sets as hard asstone, even when kept under water. With regard to iron oxide Landolt states that this sub- IRON-CORROSION AND ANTI-CORROSIVE PAINTS. 85 stance uniting with a much larger proportion of linseedvarnish should, when used as a bottoming paint, receive anaddition of oil of turpentine ; , the first coat should be low. Fig. 38 (magnified).—Pine (liair) cracks in a ten-year-old white lead paint. in varnish, the final coat richer. The poor results obtainedwith iron oxide paints may, when bad materials are used, bevery often due to the non-observance of this rule. 86 lEON-COBROSION AND ANTI-COBEOSIVE PAINTS. Further references to the utihty of a large proportion ofoil or varnish in paint will be made in the following sectionon anti-corrosive paints . Every oil paint, no matter whether the contained pig-ment absorbs much or little oil or varnish, in time comes todestruction. The actual period, however, at which this occursvaries, and depends on the amount and quahty of the varnishused. All paints perish at some time or other, either as a
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