342  PREPARATION  OF  ANILINE  GREEN. 
completely  intermediate  between  the  two  parent  species  when  left 
to  itself,  fecundated  by  its  own  proper  pollen,  is  spontaneously 
dissevered  at  the  second  generation,  dividing  its  offspring  between 
the  two  species. — London  Pharm.  Journal,  July,  1865,  from 
Med.  Press, 
PREPARATION  OF  ANILINE  GREEN. 
One  part  of  fuchsine  is  treated  with  a  mixture  of  one  and  a 
half  parts  of  sulphuric  acid  and  half  a  part  water,  and  the  whole 
is  gradually  heated  to  dissolve  the  fuchsine ;  after  the  solution 
has  cooled,  four  parts  of  aldehyde  (prepared  as  below)  are  added. 
Heat  is  then  carefully  applied  to  the  mixture,  and  as  soon  as  it 
becomes  of  a  bright  bkfe  color  the  heat  is  withdrawn.  The  color 
is  best  observed  by  letting  a  drop  or  two  fall  into  water  acidu- 
lated with  sulphuric  acid.  The  heat  must  be  continued  until  no 
violet  shade  is  seen.  When  the  change  to  blue  is  perfect,  boiling 
water  and  hyposulphite  of  soda  are  added  simultaneously,  the 
mixture  is  stirred  and  thrown  on  a  cloth  filter.  The  residue  is 
washed  with  quite  boiling  water  until  it  is  all  dissolved.  The 
filtrate  is  then  allowed  to  stand  for  twenty-four  hours,  and  is 
then  again  filtered.  The  mass  now  remaining  on  the  filter  is  the 
green  color,  which  is  dried  at  30°  to  38°,  and  then  powdered. 
Manufacture  of  Aldehyde  for  the  preparation  of  Aniline  Green, 
— 350  parts  of  sulphuric  acid  are  first  diluted  with  150  parts  of 
water,  and  when  the  mixture  has  cooled  820  parts  of  alcohol  are 
gradually  added.  The  mixture  is  placed  in  a  vessel  of  glass  or 
earthenware  fitted  with  a  tube  and  stopcock.  In  a  tubulated  re- 
tort 300  parts  of  bichromate  of  potash  in  small  pieces  and  150 
parts  of  water,  are  placed.  The  tubulus  of  the  retort  is  fitted 
with  a  funnel,  and  heat  being  applied,  the  mixture  of  sulphuric 
acid  and  alcohol  is  allowed  to  run  gradually  into  the  retort.  The 
aldehyde  distils  over,  and  may  be  collected  by  the  ordinary  ap- 
pliances. It  requires  one  or  two  rectifications. — London  Chem. 
News,  June  23,  1865,  from  Chem.  Central  Blatt,  1865,  p.  368. 
