Clifton College Scientific Socidy, 77 



a^'inrcdol"^'"" ^■"^^■^^^^' ^^^^^^^"^ -^--' -hich are called 



A weak solution of bleaching powder gives a purple colour Tl„-= 



fact, Runge, m 1835, had discovered is T inn™ 1 V ^°'^"^- . -^^"s 



colounng matter capable of bein. flied ..i™ fcl^™ Ti ™,'.'' 

 the f«mdati„„ of tl/e ,a.t i„d„st,y of :Lre"c* ?' ■""* ""-^ '"■" 



iiy the action of mercuric chloride stnimiV pMov,viA 

 &c on aniline, a beautiful red Sr s obtaitra',^^^^^^^^^^^ 

 called rosaniline being formed. The salts o,t .oil i ^ ^""'^ 

 rosaniline itself beinj colourless Thpv n,-! / ''\ "^W^^^^ 

 crimson colour which Hoft.TobtainTcUn ^^^ ^f' '^^ 



sT„f.t:^ -^ .o.„ia4t°:ean;^,'^ ^ stts.^ 



If we add the formula of one molecule of aniline to thnf nf fw p 

 toluidme, and subtract six atoms of hydroiJwe Lt tt fn, T ""I 

 the colourless base, rosaniline, thus ,J^^^^^^ ^^ ^'^ "^'^ fo™»la of 



Co H, H, N + 2 0, H, H, N - 3 H, = C H ]\t 



C. H, I ^3 



wi™:n?^^^:;r^tffte'vr?\rp?^«^^- ^i- salts 



beautiful colou-r The salt wiThthTZ ^^^^'^'^"d ^«ted for their 

 stable and.far more soJ^wfil^it^d^ZZf ^''^ ^- 



By heating a salt of rosaniline with aniline,*3 H are renkrpd 1.. 

 3 Co H, and we obtain a beautiful blue which is f5,.if ^f l^^^^^*!, by 

 or standard blue (Paris or Lvons blno? Wiii t^'Phenyl rosaniline 



different tints are obtained.^ ^^ '''*'^" ^'^ '^^^^^^'^"^ stages 



Anthracene, C^, H^o, is the other product of coal f.r t • i 

 particularly to speak of Tn flip ,^n,^ il . -. i ^^ *^^ ^ ^ish 

 lustre, and a beSful violt fltrS 1 ? tI 'f ' ^f '"^'^ ^'"*« 



