The Coal Tar Colours of the Farbwerke Vorm. Meister Lucius & Brüning, Höchst On the Main, Germany
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Bluc-violct solution, diluted bluc- sulphupic acid ^^^^. ji,^,^^,j ^.^,,^, ^,„ ^j^^jj^^, brown flocks separate. Dark green solution, diluted reddish- blue ; on heating dark olive-brown, diluted brown, on standing almost complete dark ))rccipitalion, fdtratc pink. Dark green solution, diluted violet . on hciting blackish, diluted vii.ii i turbidity, ruby-red filtrate. Dilute sulphuric or hydrochloric Unchanged. acid Slight violet turbidity, filtrate on healing somewhat redder violet. Somewhat re...dder violet. III the cold, partial precipitation Dilute nitric acid d.uk blue; on boiling, mostly soluble. Partial precipitation dirty grey- violet, violet-red filtrate. In the cold, a little redder ; on heal- ing, a sUght grey turbidity, filtrai. violet-red. In the cold, comjilete precipitation Sodium hydrate violct-black ; n heating somewhat soluble, filtrate violet. In the cold, comjiletely precipitated dirty grcy-violet ; on heating, a trace is soluble. Dark blue-violet precipitate, filtraie in the cold pink; on heating, more , soluble, filtrate violet-red.
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