To  Water-proof  Cylinders  of  Paste'
board.  The  so-^led  Chinese  lacquer
is  best  adapted  for  this  purpose.  It
consists  of  a  mixture  of  4  parts  of  slaked
lime  and  3  of  fresh  blood,  to  which
some  alum  has  been  previously  added.
As  soon  as  the  mixture  is  complete  it
is  applied  to  the  pasteboard  with  a
large  soft  brush.  When  the  first  coat-
ing is  dry  a  second  is  laid  on,  which
suffices  to  make  the  pasteboard  im-
permeable to  water.
To  Produce  Enamelled  Writing  Sur^
faeces  on  Pasteboard  and  Paper.  A
mixture  of  bleached  shellac  and  borax
dissolved  in  10  per  cent,  of  water  and
glue  and  vine-black  rubbed  to  an  im-
palpable powder  is  used  for  the  first
coloring  material.  It  is  transferred  to
the  paper  to  be  coated  by  means  of  a
felt  roller,  and  distributed  with  a  brush.
The  paper  is  then  dried  and  rolled  up.
After  tnis  operation  a  second  color  con-
sisting of  vine-black,  pergamentine
(water-glass  and  glycerine)  is  used,  the
paper  receiving  three  coats  of  this.  It  is
then  cut  into  suitable  sizes,  steamed  at
a  temperature  of  248°  F.,  and  finally
smoothed  by  calendering.  For  white
tablets  Kremnitz  white  is  used  in  place
of  vine-black ;  for  colored,  ultramarine,
ete.
Imitation  of  Mother-of- Pearl  on  Pa'
^er.  Stout  paper  with  a  glossy  coating
is  allowed  to  float  upon  a  solution  or
salts  of  silver,  lead,  or  bismuth.  As
soon  as  the  paper  lies  smooth  upon  the
surface   of  the  solution  it   is  slowly


TECHNO-CHEMICAL  RECEIPT  BOOK.
