ANILIN  BLACK  USED  AS  INDELIBLE  INK  FOR  LINEN.  335 
&c.  The  scum  is  separated,  and  the  fat  becomes  clear  and 
transparent.  When  it  is  cooled  it  is  washed  by  malaxation  many 
times  with  water,  till  the  salt  is  removed.  It  is  then  held  in  a 
state  of  fusion,  at  a  temperature  sufficient  to  evaporate  all  the 
water,  without  injuring  the  fat. — Bulletin  de  la  Sociele  de  Pharm. 
de  Bruxelles. 
ANILIN  BLACK  USED  AS  INDELIBLE  INK  FOR  LINEN. 
By  Dr.  Jacobsen. 
This  ink  should  be  kept  in  the  form  of  the  two  following  so- 
lutions : 
I.  Solution  of  Copper.  Take  8*52  gms.  crystallized  chloride 
of  copper,  10-65  gms.  chlorate  of  soda,  5*35  chloride  of  ammoni- 
um, and  dissolve  these  in  60  gms.  of  distilled  water. 
II.  Solution  of  Anilin.  Dissolve  20  gms.  chlorohydrate  of 
anilin  in  30  gms.  of  distilled  water,  and  add  to  it  20  gms.  of  a 
solution  of  gum  arabic  (1  gum  to  2  of  water)  and  10  gms.  of 
glycerin. 
On  mixing  four  parts  of  the  anilin  solution  with  one  part  of 
the  copper  solution,  a  greenish  liquid  is  obtained,  which  can  be 
used  immediately  to  write  on  the  linen,  but  it  changes  after 
several  days.  It  is  necessary,  therefore,  to  keep  the  solutions 
separate  until  wanted.  The  characters  may  be  traced  with  a 
pen,  brush  or  pencil ;  if  the  liquid  does  not  flow  well  in  the  pen 
it  may  be  diluted  sufficiently  without  fear  of  diminishing  the  in- 
tensity of  the  color,  which  appears  first  pale  green,  and  becomes 
gradually  black  by  exposure  to  the  air.  The  writing  may  be 
rendered  black  instantly  by  passing  over  it  a  hot  iron,  or  heating 
moderately  the  under  side  over  a  spirit  lamp.  It  is  even  better 
to  expose  it  to  a  current  of  steam,  which  is  sufficient  to  develope 
instantly  the  anilin  black.  After  this  treatment  the  tissue  is 
washed  with  warm  soapsuds,  when  the  characters  will  present  a 
beautiful  blue  black  hue.  This  ink  resists  acids  and  alkalies, 
and  if  the  ink  has  penetrated  the  linen  so  as  to  render  the 
characters  visible  on  the  reverse,  there  is  n:»  fear  that  the  color 
will  be  altered  by  lye. — Jour,  de  Chim.  Med.,  June,  1868. 
