Am.  Tour.  Pharm. 
May,  1919. 
Modem  Paint  V chicles. 
295 
thoroughly  legitimate  use  in  the  paint  industry.  Of  these  oils,  soya 
bean  oil  is  the  most  prominent.  From  the  standpoint  of  resistance 
to  exposure  it  compares  favorably  with  linseed  oil.  One  of  the  most 
promising  uses  for  soya  oil  is  for  the  grinding  of  oil  colors.  When 
used  for  this  purpose,  soft  pastes  are  produced  which  do  not  become 
hard  even  upon  long  standing  (probably  because  of  the  very  low 
acid  value  of  soya  bean  oil).  Moreover,  the  amount  of  soya  oil  that 
would  be  introduced  into  a  white  paint  base  as  a  result  of  the  use 
of  such  colors  would  be  extremely  small,  since  relatively  small 
amounts  of  color  are  required  for  making  most  tints  or  shades." 
This  brings  us  once  more  to  the  question  of  the  newer  paint  oils. 
What  shall  or  can  the  painter  do  with  them?  Speaking  broadly,  I 
should  say — nothing!  Proper  laboratory  facilities  and  expensive 
tests,  lasting  over  many  months,  and  sometimes  years,  are  necessary 
to  prevent  endless  complaint  and  trouble  from  the  use  of  the  wrong 
material  for  the  wrong  job. 
Soya  bean  oil,  properly  freed  from  moisture,  by  mild  heating, 
may  be  an  exception  to  this  rule.  So  far  as  tests  have  indicated, 
twenty-five  per  cent,  of  such  oil  added  to  a  good  grade  of  linseed 
performs  in  all  respects  like  straight  linseed  oil. 
Of  hemp  oil  we  know  very  little  in  this  country,  but  European 
experience  and  its  chemical  and  physical  characteristics  warrant  the 
expectation  that  when  made  available,  it  will  make  an  acceptable 
substitute.  K 
Perilla  oil  has  worked  out  very  nicely  for  varnish,  besides  being 
a  first-class  paint  oil.  Typical  rosin,  China  wood  oil  varnishes  con- 
taining perilla  oil,  showed  slightly  better  wearing  qualities  when 
exposed  to  weather  than  those  made  with  linseed  oil. 
Lumbang  oil  is  also  a  varnish  oil,  but  with  proper  treatment  may 
be  useful  in  paints. 
The  Philippine  Journal  of  Science  for  September,  1917,  contains 
a  most  interesting  article  on  the  "  Comparison  of  Linseed  Oil  and 
Lumbang  Oils  as  Paint  Vehicles,"  by  R.  H.  Aguilar. 
He  describes  tests  and  gives  results  of  analyses  on  two  varieties 
of  lumbang  oil,  lumbang  bato  and  lumbang  banucalag.  The  oils  are 
expressed  from  the  seeds  of  trees,  lumbang  bato  coming  from  the 
candlenut  tree,  which  is  known  in  Hawaii  as  kukui.  This  tree  is 
very  widely  distributed  through  India  and  Malaya  to  the  Islands 
of  the  Pacific. 
