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Show 0 YOU KNOW WHAT WHITE LEAD 18? Its Chief Use and a Method of Determining Deter-mining Good from Bad Explained. Whlto Load la tho standard paint material all over tho world. It Is mndo by corroding metallic lead Into a whlto powder, through exposing it to tho fumes of weak acetic acid and carbonic ncld gas; this powdbr Is then ground nnd mixed with linseed oil, making a thick pasto, in which form it is packed nnd sold for pnlntlng purposes. Tho painter thins it down to tho propor consistency for application by tho addition ad-dition of moro linseed oil. Tho nbovo refers, of courso, to puro, genulno Whito Lead only. Adulterated nnd fnko "Whlto Load," of which thoro aro many brands on tho market, Is generally somo sort of composition containing only a percentngo.ot whlto lead; sometimes no Whlto Lead atoll; In such stuff, barytcs or ground rock, chalk, and similar cheap substances nro used to mako bulk and lmltato tho appearance of puro Whlto Lead. Thcro is, howover, a positlvo tost by which tho purity or impurity of Whlto Lead may bo proved or exposed, bo-foro bo-foro painting with It Tho blow-pipe flnmo will rcduco puro white lead to metallic lead. If a supposed whlto lead be thus tested and It only partially reduces to lead, leaving a residue, it is proof that something elso was thcro besides whlto lead. Tho National Lead Company guar-nnteo guar-nnteo all Whlto Lead sold In packages bearing its "Dutch Boy Palntor" trado-mark trado-mark to provo absolutely puro undor this blow-plpo test, and that you may mako tho test yourself in your own homo, they will send freo upon ro-quest ro-quest a blow-plpo nnd everything elso necessary to mako tho test, togcthor with a valuable booklet on paint. Address, Ad-dress, National Lend Company, Wood-brldgo Wood-brldgo Building, Now York. |