:>oi) On Chemical Tests. [Oct. 



TESTING BY THE BLOW-PIPE. 



Abbreviations. P. means platina P. w. platina wire. P. fo : platina foil 



Substance. 



1 Alumina........ 



2 Antimony, oxide 



3 Baryta 



Hydrate... 

 „ Carbonate.. 



4 Bismuth 



5 Cadmium, oxide. 



6 Cerium, oxide... 



7 Chromium oxide. 



8 Cobalt oxide.... 



9 Columbium oxide 



10 Copper oxide. . . . 



11 Clucina. 



12 Iron, oxide 



On Platina. 



0 



No change 



Fuses readily, sub- 

 limes in white 

 fumes: precipita- 

 ted oxide burns 

 like tinder into 

 antimoniousacid. 



Infusible 



No change 



Ox : f: no change 



On Charcoal. 



No change 



Is reduced 



Infusible 



Ox. f. black globule; 

 flows over the char- 

 coal; under surface 

 reduces. R. f re- 

 duces with strong 

 heat gives a bead of 

 metal 



No change 



R. f. blackens and be- 

 comes magnetic 



With Soda, 



Swells : infusible 



P: w : fuses into a 

 clear colourless glass 

 which becomes white 

 on cooling 



On ch. the hydrate & 

 carbonate fuse and 

 are absorbed 



On p : w : not fused 

 on ch. reduced; sub- 

 limes and leaves a 

 circular yellowish 

 mark. 



On ch. not fused, soda 

 absorbed; white or 

 greyish white oxide 

 remains on the ch. 



On p. w. and ox. f dark 

 orange glass: opa- 

 que and yellow on 

 cooling. R. f opa- 

 que, glass green on 

 cooling On ch. ab- 

 sorbed but not re- 

 duced 



On p. w. pale red by 

 transmitted light, 

 grey, cold. 



Combines with effer- 

 vescence but not fu- 

 sed, nor reduced. 



On p. w. fine green 

 glass, hot : on cool- 

 ing colourless and 

 opaque. On ch. 

 absorbed and re- 

 duced 



No action 



On ch. absorbed and 

 reduced; not fused. 



Bubbles : fuses 

 Fuses readily into 

 a glass enamel 

 white when cold. 



(Oxide) fuses rea- 

 dily, mass dark 

 brown : yellowish 

 on cooling. In 

 very intense heat 

 reduces and per- 

 forates the foil. 



No change 



Oxide becomes 

 peroxide 



No change 



No change 

 No change 



Is absorbed 



Effervesces becomes 

 caustic and is absorb- 

 ed 



Flies off in fumes leav- 

 ing a mark with red, 

 or orange edges, 

 which may be dissi- 

 pated in R. f. with- 

 out colouring the 

 flame. Oxide, in- 

 stantly reduced 

 Soon dissiputesjleaves 

 a red or or-ange yel- 

 low powder on thech. 



Per. ox: does not al- 

 ter 



No change 



No change 

 No change 



