53&  Preservation  of  Hydrogen  Peroxide.  { 
Am.  Jour.  Pharm. 
December,  1913. 
tion  by  the  phenylhydrazine  method  showed  the  same  crystalline  form 
as  the  ozazone  prepared  from  invert  sugar  and  that  a  mixture  of  as 
small  an  amount  as  10  per  cent,  of  chicory  in  coffee  showed  crystals 
of  the  ozazone  by  the  phenylhydrazine  test,  while  the  pure  coffee 
decoction  contains  so  little  reducing  sugars  as  to  yield  no  distinct 
crystals. 
The  estimation  of  reducing  sugars  in  the  above  work  was  by  the 
official  method  in  Bulletin  107,  U.  S.  Dept.  of  Agriculture,  Bureau 
of  Chemistry,  and  the  results  calculated  to  dextrose  by  Allihn's  table 
in  the  same  book. 
The  foregoing  results  clearly  indicate  that  a  coffee  decoction 
which  contains  more  than  3  per  cent,  of  reducing  sugars  in  its  ex- 
tractive matter  may  be  looked  upon  as  adulterated  with  chicory  or 
some  similar  product  high  in  reducing  sugars.  The  method  described 
above  may  also  be  used  as  a  confirmatory  method  where  chicory 
has  been  detected  by  microscopic  examination. 
THE  PRESERVATION  OF  HYDROGEN  PEROXIDE  BY 
MEANS  OF  ACETANILIDE. 
By  A.  M.  Clover. 
During  the  past  few  years,  it  has  become  an  almost  general  cus- 
tom to  add  a  small  quantity  of  acetanilide  to  solutions  of  hydrogen 
peroxide  in  order  to  prevent  the  decomposition  ordinarily  taking 
place.  This  very  remarkable  property  of  acetanilide  has  made  it 
possible  for  manufacturers  to  place  upon  the  market  a  peroxide  solu- 
tion that  retains  its  strength  for  a  long  period  of  time  and  has  elimi- 
nated almost  entirely  the  danger  arising  from  decomposition. 
There  has  been  some  discussion  as  to  the  necessity  and  justifi- 
cation for  the  use  of  acetanilide  and  the  claim  has  been  made  that  the 
instability  of  the  commercial  peroxide  solution  is  brought  about 
by  certain  impurities,  which  are  introduced  during  the  process  of 
manufacture,  and  that,  were  the  methods  of  preparation  so  controlled 
as  to  eliminate  these  impurities,  a  stable  product  would  result.  In 
view  of  the  greatly  increasing  use  of  hydrogen  peroxide  this  question 
is  one  of  considerable  importance  and  the  following  experimental 
work  has  been  designed  to  bring  out  the  facts  relative  thereto.  It 
has  been  found  possible  to  prepare  a  chemically  pure  solution  of 
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