m 3 Scientific Intelligence. 
: held in the bright blue colored mantle which forms the — portion of 
e flame. c. Flame colors. © produce these, the loo 
so and in the hottest part of the mantle. The ee ts flame 
yields another Ss} ecies of me the core colors. T hese are produced 
lue and green tinge to the Seid core of the hydrogen flame 
” ‘Nitric and ah ast give a bronze green border color, usually i 
an orange colored border. ‘The test is to be previously dried in the 
and dipped into a solution of bi-sulphate of potash, or into dilute cour 
acid, according as we wish to sat Re nitric or nitrous acid. The sensi- 
acid and held in the face: in the manner meee i ose out, in order to 
show the border color. The sensitiveness is g55 mgrm. The green core 
color is less sensitive, but indispensable in recognizing phosphoric acid in 
the presence of large quantities of boric acid, and is produced by alter 
loop i 
- middle of the flame. In the latter case, it is well to dip the test into 
eg muriatic or fluo-silicie acid. The sensibility for sulphuric acid is 
co Mgrm., for a sulphate, +555 mgrm 
Boric “acid: gives a beautiful green mantle color, which is so intense that 
aci 
Molybdic acid gives a yellowish green flame-color like that of baryta, which 
is however very fleeting, and on na 
riatic acid. 
Muriatic acid gives a very weak greenish blue scscpne ai which lasts 
for a very short time, and therefore does not dese: e acid 
is however oe into free ce which ie easily be recognized. 
ash gives a grey blue mantle-color and a rose violet flame color 
These colors ome reddish violet through the blue glass, violet through 
a violet glass, and blue green through a gree n glass. Potash is reco, ecognized 
in the presence of lithia, as well as through so thick a layer of bine glass 
that the lithium red is no longer visible. The test is to be moistened with 
sulphuric acid, and repeatedly exposed to the flame for a short ne The 
gol iS 37 mgrm., for blue, m. g 
iden 33 an orange yellow flame-color, which in very large quantities 
ce pure blue, but in small quantities is invisible through the blue 
