Hair  containing  lead,  when  digested  in  dilute
nitric  acid,  gives  a  solution  of  nitrate  of  lead,
in  which  form  it  is  readily  detected.  See
Leas  and  Silteb.
All  the  preceding  compounds  are  for  dyeing
living  hair  (human) ;  horse-hair,  bristles,  &c.,
and  other  dead  hair,  may  be  readily  stained  by


HAIRWASH— HANDS


839


■teeping  them  in  any  of  the  ordinary  liqaid
dyes,  more  especiaUy  those  employed  for
wool   and    silk.       See   Pouades,  Washes,

HAIBWASH,  Golden,  or  Anricomns,  is  a
clear  inodorous  fluid,  which  is  said  to  dye  hair
blond  or  yellowish  red,  and  really  does  so.
Sold  iu  bottles  containing  250  grammes.
When  exposed  to  the  air  the  fluid  decomposes
with  time.  This  hair-dye  is  an  aqueous  solu-
tion of  hydroxyl  contaminated  with  traces  of
baryta,  and  can  be  prepared  as  follows : — 17
p.irts  crystallised  caustic  baryta  and  3  parts
potassium  chlorate,  intimately  mixed  in  fine
powder,  are  melted  by  a  gentle  heat.  The
mass  must  be  washed  with  cold  water  to
removethe  potassium  chloride,  and  the  residue
shaken  in  the  cold  with  a  solution  of  8  parts
glacial  phosphoric  acid  in  25  parts  water,  the
whole  being  cooled  with  ice.  When  the  per-
oxide of  barium  is  decomposed,  the  fluid
should  be  decanted  from  the  precipitate.
(Huger.)

HAIiIi  MARES.  The  'Hall  Marks'  on
articles  in  gold  and  silver  not  only  inform  us
of  tlieir  lineness,  but  furnish  us  witli  other
important  particulars.
