| 配方类型： |
INTRODUCTION |
| 配方组成： |
rosin oil/20
castor oil/8
rosin/32 |
| 配制方法： |
heat this mixture in an aluminum or enamelled pot on a gas stove, with stirring, until all the rosin has melted and dissolved. while hot, pour on firm paper sheets of suitable size which have been brushed with soap water just before coating. smooth out the coating with a long knife or piece of thin flat wood and allow to cool. if a heavier coating is desired, increase the amoumt of rosin. similarly, a thinner coating results by reducing the amount of rosin. the finished paper should be laid flat and not exposed to undue heat. |
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