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  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  oil. 
  Such 
  colors 
  are 
  very 
  susceptible 
  and 
  hence 
  have 
  to 
  be 
  burned 
  

   in 
  muffles. 
  They 
  are 
  also 
  strongly 
  influenced 
  by 
  the 
  degree 
  of 
  

   temperature 
  to 
  which 
  they 
  are 
  subjected, 
  and 
  hence 
  the 
  different 
  

   colors 
  are 
  often 
  burned 
  separately, 
  those 
  standing 
  the 
  highest 
  tem- 
  

   perature 
  being 
  applied 
  and 
  burned 
  first, 
  and 
  those 
  most 
  affected, 
  

   last. 
  This 
  method 
  of 
  decoration 
  requires 
  repeated 
  burning, 
  but 
  it 
  

   permits 
  a 
  variety 
  and 
  richness 
  of 
  color 
  not 
  attainable 
  in 
  under- 
  

   glazed 
  work. 
  

  

  In 
  preparing 
  these 
  colors, 
  it 
  is 
  highly 
  essential 
  that 
  they 
  be 
  

   ground 
  as 
  finely 
  as 
  possible, 
  and 
  underglaze 
  colors 
  are 
  generally 
  

   mixed 
  with 
  water 
  before 
  being 
  applied, 
  the 
  porous 
  body 
  of 
  the 
  tile 
  

   absorbing 
  the 
  moisture 
  and 
  causing 
  the 
  color 
  to 
  cling 
  to 
  it. 
  If 
  this 
  

   does 
  not 
  happen, 
  the 
  color 
  must 
  be 
  mixed 
  with 
  oil, 
  in 
  which 
  case 
  the 
  

   ware 
  must 
  be 
  fired 
  lightly 
  at 
  first, 
  to 
  burn 
  it 
  off. 
  

  

  At 
  the 
  present 
  day, 
  where 
  a 
  number 
  of 
  tile 
  with 
  the 
  same 
  

   design 
  are 
  made, 
  the 
  design 
  is 
  applied 
  mechanically. 
  This 
  is 
  

   effected 
  by 
  a 
  process 
  of 
  printing, 
  the 
  pattern 
  being 
  printed 
  on 
  paper 
  

   from 
  a 
  plate 
  and 
  this 
  transferred 
  to 
  the 
  tile. 
  Usually 
  but 
  . 
  one 
  

   color 
  at 
  a 
  time 
  can 
  be 
  printed 
  on 
  the 
  paper. 
  But 
  in 
  more 
  recent 
  

   years 
  it 
  has 
  been 
  found 
  possible 
  by 
  a, 
  process 
  of 
  chromolithography 
  

   to 
  print 
  several 
  colors 
  on 
  the 
  ware 
  at 
  once. 
  

  

  