The New Orleans crescent. [volume] (New Orleans, La.) 1866-1869, 1868-11-14

MANUFACTURE OF ARTIFICIAL DIAMONDS The
FRENCH publication, La Propagation IndastrieIIe
publishes description By NJ. Caliste Saix Of bis
method OF producing coorless, colored. or black
diamonds. The system Ii based on a prjncjnIe
that when current of chlorine or of bvdrorbs
Ioric gas passes through cast iron in Iiouid state
Pe.scnlerlde or protochloride of iron is formed.
!he cast iron remaining in both cases perfectIv
Intsct, because the chlorine cannot directly mite
WIN 10. The capitalization OF the carbon Il thar
WITHIN the general rule for in body which is dis
solved and capable of capitalization crvsteIi1s.
tion takes place each time that the dssolvinr
agent evsporates, the size of the crystaIs 5s
pending always on the slowness of the eyanors.
uon. LIST; TO obtain colorless diamonds, current
OF dry chlorine must be brought to the bottom NJ
The current containing the cast iron nv means ~
Dent tube OF china or frs-clay. No organic
coioriDg matter resists the action of cbIorins'
20 That the perchloride of iron in evaporating
leaves the carbon TO become a colorless crys.
tai. I'd. When it is desired 70 rivs 0t rs
crystal blue, green. pink, or yellow tint IL il
Only necessary to mix with the cast iron certain
metallic oxides in sufficient quantity such az tbose
=. CHROMIUM, COBALT. and others. or their salts,
winch VIII give these colors. 3. To obtain black
diamond, hydrochloric gas must be brought 10 the
pottom OF the crucible in the same manner "a for
eolored or colorless diamonds. Protochiorids of
iron will be formed. which is volatile but in M;
ease the carbon will remain black in conseouence
ei me presence OF hydrogen. This explains the
fact OF all diamonds having the same chemical
anq mineral properties, aud why in nature the |
bfack diamond Ii found 10 the Qreatest |
qusntsty. because it, formation in sIuyial soils |
requires only the presence Of sulphurc acid and /
marine salt, whereas the others require the pres-
ence OF particular oxides which are often wanting.
10 obtain all these varieties of diamonds special
furnaces are not necessary; the crucibles must be
coyered 20 prevent the oxidation of the cast
ifen.' which might change the carbon into
carpeni9 oxide, and diminish, in consequences. the
yield OF The operation; these crucibles should be
provided with small tube, reaching outside the
furnace, which will enable the chlorides resulting
I, y o1n. ths. rssotol to be gathered. When the
iquid cast NON has been almost completely evan
Qsssee sss< ecfan crucibles, the diamonds can be
removed without disturbing the crucibles. and bv
means OF solvents any cast iron which might be
OF cutting vii ebus be shortened for there will
ne no more oxidised particles to remove. and the
csucioie WI De ready for fresh operation. Gc.
oording e y. de Ssix one kIogrsmme of cast
IRON VIII yield ct least sixty grammes of diamond
The cost price Of the coloriess diamonds will be-
about 2of per sixty Rfsmiass, which, al the cur.
rent price. would be rs ,0oef. The cost Of the
blsck Diamonds WIN be under 81. per sixtv
efammess representing value OF IA, 2O0f-[ scier.
sin9 Americsns;-e ,as-F s-s-s y -