84 
Cold  Process  for  Official  Soaps. 
/Am.  Jour.  Pharm. 
February,  19 19. 
Cotton  seed  oil  
Potassium  hydroxide   
Water   
Oil  of  lavender   
Alcohol  a  sufficient  quantity  to  make 
1,000.00  mils. 
279.50  Gm. 
55.90  Gm. 
292.50  mils. 
20.00  mils. 
Dissolve  the  potassium  hydroxide  in  180  milliliters  of  water,  and, 
while  still  hot,  add  the  cotton  seed  oil.  Add  180  milliliters  of 
alcohol  and  stir  or  agitate  the  mixture  until  a  clear  liquid  soap 
results,  which  should  be  in  about  ten  minutes.  Allow  to  stand  for 
one  hour,  add  sufficient  alcohol  to  thoroughly  liquefy,  about  200 
milliliters,  and  112.50  milliliters  of  water.  Now  add  the  oil  of 
lavender  and  sufficient  alcohol  to  make  the  finished  product  measure 
1,000  milliliters.    Allow  to  stand  one  week  and  filter. 
Assuming  that  the  writer's  figures  are  correct,  each  ten  milliliters 
of  this  tincture  contain  exactly  6.50  Gm.  of  official  green  soap.  It 
is  now  a  simple  matter  to  determine  the  degree  of  alkalinity  using 
the  method  directed  by  the  pharmacopoeia  for  standardizing  green 
soap.  An  excess  of  alkali  must  be  avoided  and  the  preparation 
of  a  test  batch  of,  say  100  milliliters,  is  suggested.  An  assay  of 
this  test  batch  gives  at  once  the  correct  proportion  of  alkali  to  oil 
and  the  same  materials  may  then  be  used  with  confidence  for  batches 
of  any  size. 
The  saponification  of  olive  oil  by  the  cold  process  is  a  very  simple 
matter  and  this  fact  is  perhaps  the  best  argument  for  the  suggested 
modification  of  the  present  official  directions.  Even  a  properly  and 
honestly  made  castile  soap,  an  article  by  the  way  which  is  just  now 
somewhat  of  a  rarity,  is  by  no  means  easily  dissolved  in  water. 
The  following  formula  yields  a  product  which  in  every  way  meets 
the  official  tests  for  soap  liniment: 
Olive  oil   53  Gm. 
Sodium  hydroxide    7  Gm. 
Camphor    45  Gm. 
Oil  of  rosemary  ,   10  mils. 
Alcohol    700  mils. 
Water  a  sufficient  quantity  to  make    1,000  mils. 
To  the  olive  oil,  contained  in  a  suitable  vessel,  preferably  of 
LlNIMENTUM    SAPONIS.     SOAP  LlNIMENT. 
