The Canton times. (Canton, Miss.) 1893-1906, 1894-11-30
g,lITY Or coLoRs.'

.puITY or COLOno
r.st.st shades ss., 4 4as.
,;ttee having this matter IN
BE committing anorting to the chemical sec
ID, II IT, rsp british association on their
q the 'hs J = the past year, state: Dur ,
TX during : vi large number of wool
the e, ye aat I dyed with various
sl,s nd artificial orange ana yei-
c0l DIOR rssspect to their power OF r., re-
h, ,, fading ssp psse@p Ct Ct Abel near
t = n the grounds OF james a. =
d I. r Each dyed pattern was divided
r. n as;sees, one Of which was pro
= ~ rom the action Of light, !, while
ts saa IRON we're Sar exposed for different
o, Oh u fine. On silk the relative
a l0aS = Il the various colors was ior
NOS most part, the same as on wool' the
. n0D being unimportant.
|'rauge and yellow patterns gave .,a 2
ra q rstiyelv large number OF salts
ps;Ir permanent colors. In the
! ssl o. less fugitive class were to be
, q u n l the basic colors, all the nitro
NJ o. ,,;th the exception of pala-
i orange, and all the bright colors
|;ved from thenatural coloring mat
NV Nv means of aluminium and tin
ITS, with the exception OF those
LINED from weld. Comparatively
azo colors were met with in this
a far the greatest number OF vel
4, ranging from moderately fast
! very fast, n.were to be found among
40 colors. Specially important
L those in which salicylic acid was
|onstituent element, since not only
! this import to the color the power
Forming more or less stable lakes
A chromium and aluminium NOR
Its but it appeared frequently to
I the colors the quality of fastness
|ight, even when no mordant was
Blied. The colors obtained with
|minum were practically as fast as
Re fixed with chromium, since
first-named mordant gave
eh brighter and purer yellows.
tin mordant so useful in the pro-
Ition of the most brilliant orange
yellow colors obtainable from the
|ural .coloring matters, seemed, how
\, to be Of little or no advantage
connection with most of these azo
Fdant colors, no doubt, because they
Fe susceptible to the reducing action
the mordant usually employed for
b, viz, stannous chloride. Very
eresting in point of fastness to light
re the azoxy colors, and although,
fortunately, apt to dye wool some
at irregularly, giving speckled look
colors. they were admirably adapt
for silk and cotton. Another inter
Ing little group was that which in
des tartrazin, in color not only note
THY for its fastness to light. but
because of its brilliancy and
lily.
he fastness Of alizarin orange was
thy Of special mention, for it was
baby greater even than that exhib-
by most other colors of the alizarin
up, and it showed the peculiar dark
ng action exerted by the light, prob
in consequence of the presence of
nitro group. 1t was remarkable
few really fast yellows were de-
ID from the natural coloring mat
and these were chiefly the olive
lows obtained with chromium NOR
i. The only fast, and at the same
e bright, natural yellows were those
wed from weld, and since this dye
L was now of little general impor-
&c to the dyer its cultivation had
ONE extremely limited, and it was
dually being given up. 1t was
innate, therefore, that science had
able to replace it by efficient sub
utes, 50 far, at least, as permanency
ard light was concerned. The ex-
ments had already abundantly
'ed that the popular opinion that
coal tar dye stuffs included only
as yielded more or less fugitive
rs was entirely false; indeed, it
perfectly safe to assert that coal
was the source from which the
''est number of colors fast to light
derived at the present time, and
seemed to be especially true of the
ana yellow colors.-St. Louis Re-