Adulteration  of  White  Lead. 
271 
Am.  Jour.  Pharm.  1 
June  1,  1873.  J 
Equal  volumes  of  acid  and  of  oil  dissolved  in  bisulphide  of  carbon 
Fine  violet  coloration  passing  into  brown — Whale. 
Same  proportions,  without  sulphide  of  carbon  : — 
Deep  green  coloration — Rape,  linseed,  hemp. 
Red  coloration — Whale. 
Reaction  of  Elaidin. — The  mass  becomes  solid,  clotty  and  white — 
Olive,  almond,  rape  (bleached).    Ordinary  rape  oil  gives  a  yellowish 
mass. 
Red  solid  mass — Sesame. 
Waxy  white  mass — Castor. 
The  mass  of  elaidin  traversed  by  oily  stride — Mixture  of  drying 
oils. 
No  action — Linseed,  poppy,  nut. 
Ebullition  with  Water  and  Litharge  : — 
Solid  plaister — Olive. 
Viscous  plaister — Rape,  almonds,  sesame. 
Viscous  plaister,  growing  hard  in  course  of  time — Drying  oils* 
Solubility  in  Alcohol. 
Olive  . 
Poppy 
Hemp 
Almond  ( Brassica  cam- 
pestris)  .  .  0.914 
Olive  .       .       .  0.918 
1  :    1  Linseed 
1  :  25  Almonds 
1  :  30 
Specific  Gravities. 
Sesame 
Sunflower 
Castor 
Linseed 
1  :  40 
1  :  60 
0.923 
0.926 
0.950- 
0.930 
Melting-points. 
Degrees.  C 
Hemp       .       .  — 27 
Castor      .       .  — 18 
Linseed  .  .  —  16  to  —  20 
Sunflower       .  — 16 
Rape        .  —  6 
-Chem.  News,  1873,  May  2. 
Degrees  C. 
Brassica  campestris        —  4 
Sesame    .  —  5 
Olive       .        .  2.5 
Almond    .       .  — 20  to  —  25 
ADULTERATION  OF  WHITE  LEAD. 
By  Rudolph  Wagner. 
It  has  been,  and  is  still,  to  some  extent,  the  custom  in  the  manufac- 
tories to  add  to  white  lead  a  certain  quantity  of  sulphate  of  baryta,  either 
native  or  artificially  prepared.  Lead  is  often  mixed  with  sulphate  of 
lead,  chalk,  carbonate  of  baryta,  sulphate  of  baryta,  and  pipe  clay  ;  but 
these  adulterations  are  most  common  in  the  retail  trade.    Not  any  of 
