Wet-coloured  scrap,    3  grs.  of  copper  per  ounce
l2-carat  scrap  6  ,,  „

10        „  9  ,,  „

9        „  12

Hall-marked  make  no  addition  whatever

All  qualities  of  scrap  should  be  well  sorted  and
undergo  the  action  of  a  magnet  before  re-melting,
and  the  greatest  care  exercised  in  keeping  every
quality  separate.
.Sometimes  in  re-melting  scrap-gold  it  is  neces-
sary to  make  some  addition,  either  in  fine  gold  or
alloy,  for  the  purpose  of  improving  or  reducing  the
quality.  This  happens  when  different  qualities  of
goods  are  required  on  the  spur  of  the  moment,  and


64  MELTING  AND  ROLLING.
it  may  not  be  convenient  to  procure  fine  gold  at  the
time  sufficient  for  the  purpose  ;  this  is  very  often
the  case  with  beginners  who  have  embarked  in
business  with  a  limited  capital,  which  may  already
be  partially  invested ;  to  such  persons  the  advice
we  now  give  may  prove  serviceable.  There  may
be  possibly  existing  at  the  time  in  the  workshops,
a  large  quantity  of  scrap  of  the  regular  quality  ;
and  if  the  proper  rules  for  alloying,  in  reference  to
reducing  and  improving  the  qualities,  were  under-
stood thoroughly,  use  might  be  made  of  it  in  the
above  direction  ;  not  only  to  the  pecuniary  interest
of  the  man  of  business,  but  also  to  the  advantage
of  all  parties  concerned.  We  shall  be  as  simple
and  as  concise  as  possible  in  our  modes  of  calcula-
tion, and  will  employ  the  usual  arithmetical  signs.
