The  liquid  may  contain  either  a  solid,  another
liquid,  or  a  gas.
Solution,  Bain's  Printing  — The

solution  used  in  Bain's  chemical  telegraph.
Bain's  solution  is  made  by  mixing  together  one
part  of  a  saturated  solution  of  potassium  ferro-
cyanide,  with  two  parts  of  water.
Solution,  Battery The  exciting

liquid  for  voltaic  cells.  (See  Cell,  Voltaic.)

Solution,  Chemical,  Bain's A  solu-
tion employed  in  connection  with  Bain's  re-
cording telegraph.  (See  Recorder,  Chemical,
Bain's)

Solution,  Quicking A  solution  of

a  salt  of  mercury,  in  which  objects  to  be  elec-
tro-plated are  dipped  after  cleansing,  just
before  being  placed  in  the  plating  bath.
If  the  articles  have  been  properly  cleansed,  im-
mersion in  the  quicking  solution  will  cover  them
with  a  uniform,  silver-like  coating,  which  will  in-
sure an  adherent,  uniform  coating  in  the  plating
bath.
Solution,  Saturated A  solution  in

which  as  much  of  the  solid  or  other  substance
has  been  dissolved  in  the  liquid  as  it  will  take
at  a  given  temperature.
Solution,  Super-Saturation  of

The  condition  assumed  by  a  warmed  satu-
rated solution  of  a.  salt,  when  placed  in  a
closed  vessel  out  of  contact  with  the  air,  and
allowed  to  cool  without  being  shaken.
Under  the  above  circumstances  the  solution
may  be  cooled  without  depositing  any  crystals.
Such  a  solution  is  said  to  be  super-saturated.  It
will  immediately  deposit  crystals  if  a  crystal  of  the
salt  dissolved  or  a  crystal  of  an.  isomorphous  salt
be  dropped  in  the  solution,  or  often  if  merely
shaken.
It  is  important  in  standard  voltaic  cells  in
which  zinc  sulphate  is  used,  that  the  solution  be
saturated  but  not  super  saturated.
