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cupellation


cupellation


  1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Cupellation  \Cu`pel*la"tion\  (k[=u]`p[e^]l*l[=a]"sh[u^]n)  n. 
  [See  {Cupel}.] 
  The  act  or  process  of  refining  gold  or  silver,  etc.,  in  a 
  cupel. 
 
  Note:  The  process  consist  in  exposing  the  cupel  containing 
  the  metal  to  be  assayed  or  refined  to  a  hot  blast,  by 
  which  the  lead,  copper,  tin,  etc.,  are  oxidized, 
  dissolved,  and  carried  down  into  the  porous  cupel, 
  leaving  the  unoxidizable  precious  metal.  If  lead  is  not 
  already  present  in  the  alloy  it  must  be  added  before 
  cupellation.