Iron corrosion; anti-fouling and anti-corrosive paints . ther case this isalways liable to recur. The time taken by oil paints in drying has already beenstated as from six to thirty-six, and even forty-eight hours,and depends on the drying properties of the oil or varnish,the influence exerted by the pigment, and—last, but by nomeans least—the external conditions of temperature andweather. It maj also readily happen that one and thesame paint may dry at one time in six hours, but require 88 lEON-COEEOSION AND ANTI-COREOSIVB PAINTS. at another time twelve hours and even longer. For thisdivergen
Iron corrosion; anti-fouling and anti-corrosive paints . ther case this isalways liable to recur. The time taken by oil paints in drying has already beenstated as from six to thirty-six, and even forty-eight hours,and depends on the drying properties of the oil or varnish,the influence exerted by the pigment, and—last, but by nomeans least—the external conditions of temperature andweather. It maj also readily happen that one and thesame paint may dry at one time in six hours, but require 88 lEON-COEEOSION AND ANTI-COREOSIVB PAINTS. at another time twelve hours and even longer. For thisdivergence the vs^armth and moisture content of the externalair are to blame, paint that normally dries in twelve hoursdrying in six hours under a hot sun and in a good draught,whilst in foggy weather it will still be wet at the end oftwenty-four hours. This fact has been demonstrated byinnumerable experiments, as has also the drying influenceof the pigments themselves. Thus white lead and red lead,when ground up with a linseed varnish drying in six Pig. 41 (natural size), -Cracks in an oil paint, with another, intermediatelayer. cause it to dry quicker, , in five hours ; whilst on theother hand the incorporation of ochre or iron oxide in thesame varnish will produce a paint taking twenty-four hoursto dry; and there are other pigments, lampblack for ex-ample, which will prevent this otherwise fairly quick varnishfrom drying at all when used as paint. The pigment, as wellas the conditions of temperature and moisture, must there-fore be taken into account in testing the drying capacityof a paint. IBON-COEBOSION AND ANTI-COREOSIVE PAINTS. 89 With regard to the behaviour of a pigment, its capacityfor absorbing hnseed oil or hnseed varnish, and its influenceon the drying and hardening of the latter constituent, themost suitable paint for the preservation of iron structureswill be the one that contains a pigment requirimj a large ad-mixture of linseed oil or linseed varnish i
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