OZONE  AS  A  MEANS  OF  RESTORING  ENGRAVINGS. 
539 
all  sizes,  is  of  great  advantage  to  the  holders  of  volatile  drugs, 
and  those  liable  to  spoil  by  exposure  to  the  air.  It  would  be 
impossible  to  enumerate  all  the  useful  implements  and  appliances 
that  are  made  of  stone-ware,  from  bottles  at  less  than  a  farthing 
each,  and  cheap  infusion  pots  at  9d.  each,  to  the  condensing 
worm  at  six  guineas,  and  vessels  of  enormous  bulk  at  a  much 
greater  price  Chemist  and  Druggist,  July  15,  1861. 
OZONE  AS  A  MEANS  OF  RESTORING  OLD  AND  FADED 
ENGRAVINGS,  &c.  • 
According  to  v.  Gorup-Besanez,  ozone  when  properly  applied 
is  a  most  effective  and  convenient  agent  for  restoring  books  or 
prints  which  have  become  brown  by  age,  or  been  soiled  or 
smeared  with  coloring  matter ;  only  a  short  time  being  required 
to  render  them  perfectly  white,  as  if  just  from  the  press,  and  this 
without  injuring  in  the  least  the  blackness  of  the  printer's  ink 
or  the  lines  of  crayon  drawings. 
As  examples  of  his  results  the  author  mentions  a  book  of  the 
sixteenth  century  upon  a  page  of  which  several  sentences  had 
been  painted  over,  by  the  monks  of  that  epoch,  with  a  black, 
shining  coloring  matter  in  order  to  render  them  illegible,  and 
of  which  no  trace  of  a  line  could  be  detected.  After  36  hours 
treatment  with  ozone  the  coloring  matter  was  entirely  destroyed, 
and  the  most  careful  scrutiny  of  the  page  would  have  failed  to 
discover  that  any  of  the  lines  had  once  been  painted  over.  In 
like  manner  a  wood  cut  of  Durer  which  had  been  besmeared 
with  a  dark  yellow  color  was  completely  restored. 
Writing  ink  may  be  readily  discharged  by  ozone,  especially 
if  the  paper  be  subsequently  treated  with  very  dilute  chloro- 
hydric  acid  to  remove  the  oxyde  of  iron. 
Printer's  ink  is  not  attacked  by  ozone  to  any  appreciable  ex- 
tent unless  the  action  be  long  continued.  Vegetable  coloring 
matters  are  completely  removed  by  it,  but  metallic  coloring 
matters,  grease  spots  and  stains  produced  by  fungi  cannot  thus 
be  destroyed. 
As  applied  in  the  small  way,  the  method  consists  in  placing  a 
bit  of  phosphorus  about  3  inches  in  length  and  |  an  inch  in  di- 
