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NEW  PROCESSES  FOR  COVERING  METALS,  ETC. 
1.  The  perfect  adherence  of  the  copper  deposited  on  iron,  cast 
iron  and  steel. 
2.  The  rapidity,  simplicity  and  economy. 
3.  The  faithful  reproduction  of  the  most. delicate  details. 
4.  The  beauty  of  the  colors. 
5.  The  harmlessness  and  stability  of  the  solution. 
6.  The  power  of  repairing  articles  coppered  or  covered  with 
any  other  metal  by  the  author's  processes.* 
Ordinary  Bronzes. — Yellow  bronzes  bronze  in  beautiful  tints 
in  copper  baths  without  contact  with  zinc. 
The  alloy  which  has  been  found  to  furnish  the  most  beautiful 
tints  by  the  action  of  cuprous  baths  was  formed  of, 
Copper        .....  83 
14 
0-  6 
1-  3 
1-1 
of  red  copper,  even 
Zinc 
Lead  . 
Tin      .  ' 
Nickel . 
Bronzing  of  Red  Copjjer. — The  bronzing 
when  galvanic,  is  effected  by  contact  with  zinc,  by  varying  the 
nature  of  the  salt  of  copper  and  the  proportions  of  alkali  and 
of  sodio-potassic  tartrate. 
Zincing. — Copper  or  coppered  metals  may  be  covered  with 
zinc  by  immersion  in  a  concentrated  solution  of  potash  or  of 
soda  heated  to  100°  in  presence  of  metallic  zinc. 
The  coating  of  zinc  deposited  is  fixed  and  brilliant. 
The  author  considers  the  metal  thus  deposited  to  be  less  at- 
tackable by  acid  liquids  than  ordinary  zinc. 
Tinning  and  Leading. — Copper  and  coppered  metals,  as  well 
as  cast  iron,  iron  and  steel;  may  be  tinned  and  leaded  in  contact 
with  zinc,  by  means  of  a  salt  of  tin  or  lead  dissolved  in  a  strong 
solution  of  potash  or  caustic  soda  at  50  or  100°  Centigr. 
A  deposit  of  pure  tin  or  lead  is  not  obtained  in  this  way,  for 
it  contains  zinc.  To  produce  a  deposit  of  pure  metal  of  increas- 
ing thickness,  place  in  the  vessel  containing  the  solution  of  tin 
*  For  this  purpose  clean  the  damaged  part  with  an  alkaline  lixivium, 
surround  the  part  with  an  elastic  cup  containing  the  solution,  and  touch 
the  object  with  a.  zinc  wire  ;  a  fresh  deposit  is  then  formed  on  the  metal. 
