432        DETECTION  OF  POPPY  OR  NUT-OIL  IN  OLIVE- OIL. 
which  immediately  borders  upon  the  colored  part,  a  rose  color, 
passing  rapidly  into  bright  lilac,  and  gradually  increasing  in  in- 
tensity. After  half  or  three-quarters  of  an  hour,  the  lilac  color 
passes  into  a  violet  blue,  while  the  original  yellow  gradually  be- 
comes dull  brown. 
Nut-oil  behaves  almost  exactly  the  same  as  olive-oil,  except 
that  the  yellow  substance  is  more  abundant,  more  rapidly  formed, 
and  becomes  brown  more  rapidly,  so  that  within  less  than  ten 
minutes  it  acquires  a  chestnut  color.  Sulphuric  acid  is  far  more 
easily  miscible  with  this  oil  than  with  olive  or  poppy-oil.  The 
gray  border,  which  is  characteristic  of  olive  oil,  is  produced  with 
nut-oil  as  well ;  but  in  this  case,  instead  of  gradually  becoming 
black,  it  passes  rapidly  into  olive-green.  This  oil  never  produces 
a  tint  of  lilac. 
Mixtures  of  Olive  and  Poppy-oils  may  be  tested  by  means  of 
the  above  reactions.  After  a  certain  time,  the  colors  character- 
istic of  poppy-oil,  pink,  lilac,  violet,  blue  present  themselves  suc- 
cessively, with  an  intensity  proportionate  to  the  quantity  of 
poppy-oil  present.  Marchand  states,  that  with  practice,  one- 
tenth  poppy-oil  in  olive-oil  maybe  detected  with  certainty  by  this 
method. 
Mixtures  of  Olive  and  Nut-oils. — When  the  nut-oil  amounts 
to  one-fourth  of  the  whole,  sulphuric  acid  produces  a  bright 
orange-yellow  color,  with  a  gray  border,  the  outermost  parts  of 
which  pass  into  olive-green.  A  mixture  of  equal  parts  of  both 
oils  gives  an  orange-yellow  color,  with  a  very  distinct  gray  border, 
which  soon  becomes  greenish  and  brown  at  the  outer  edge. 
When  the  mixture  contains  three-fourths  nut-oil,  a  reddish-yellow 
color  is  produced,  surrounded  by  an  olive-green  border,  paler 
than  that  produced  with  pure  nut-oil. 
Mixtures  of  Poppy  and  Nut-oils  acquire  with  sulphuric  acid  a 
yellow  color,  and  at  the  borders  a  grayish  tint,  gradually  diffusing 
itself  over  the  liquid  part.  When  the  mixture  contains  one-fourth 
nut-oil,  an  intense  lilac  is  subsequently  produced,  while  the  yellow 
color  passes  into  chestnut-brown.  When  the  mixture  contains 
three-fourths  nut-oil,  an  orange-yellow  is  produced,  with  gray 
borders,  passing  at  certain  points  into  olive-green.  Subsequently 
the  yellow  becomes  bright  chestnut-brown. — Ohem.  Graz.,  March 
15,  1854,  from  Journ.  de  Pharm.,  October,  1853 ;  and  Pharma- 
ceutical Journal. 
