Process  of  Dyeing  naturally  White
Skins,  or  Skins  with  naturally  White
Points,  various  Shades  of  Brown,  leav-
ing the  Points  White.  To  protect  the
points  from  the  dye  cover  them  with  a
resist-paste  made  by  mixing  with  water
10  parts  of  gum-Arabic,  5  of  sugar  of
leaa,  10  each  of  fat  white  elvr  and
acetate  of  copper,  and  carefully  dry  the
skins.
The  fur  is  now  freed  from  oil  and  at
the  same  time  dved  brown  by  ap]>lying
silver  litharge^  boiled  in  a  solution  of
caustic  lime,  diluted  to  4°  B.  and  cooled
to  75°  F.,  to  the  skins.  The  plumbic
oxide  dissolved  in  the  milk  of  lime
forms  with  the  sulphur  contained  in
the  fur  an  insoluble  Drown  sulphide  of
lead,  whilst  the  excess  of  milk  of  lime
frees  the  far  at  the  same  time  from  oil.
To  com)>letely  convert  the  excess  of
plumbic  oxide  in  the  mixture  and  on
the  fur  into  sulphide  of  lead  the  skins
are  placed  in  a  revolving  drum  hermeti-
cally closed  and  treated  with  very  dilute
ammonium  sulphvdrate.  Thev  are  then
brought  into  a  gallic  acid  bath,  and,  on
neutraliziiij^  this  with  lime,  brown  color-
ing matter  is  precipitated  upon  the  fiir.
The  paste  is  now  removea  by  careful
washing,  and  the  points,  having  been
neither  freed  from  oil  nor  dyed,  will  be
found  perfectly  white.  By  adding  to
the  gallic  acid  bath  small  Quantities  of
byiKwulphite  of  silver  aua  nitrate  of


bismuth  darker  tints  can  be  readily
obtained.
