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Varnish recipe 10.08.2020

Colophony cooked for 15+ hours at 150 - 180 C
  • The temperature is gradually raised to keep the same viscosity
  • Weight reduction 46%
  • Lots of stirring!! especially in the first hour when it fumes a lot 
Linseed oil heated to the same temperature and slowly stirred into the colophony
  • Cooked for 50 min together with the colophony
  • Reducing temperature to ~100 C
Mastic drops added slowly while stirring
  • Cooked for another 15 min at lower temperature to 90 - 100 C  until the varnish is very calm
Balsam turpentine heated to simmer
  • Slowly stirred into the varnish and cooked 5 - 10 min until calm again
Filtered and decanted into a glass jar
Colophony     120 g -> 65 g
Linseed oil     65 g 
Mastic            12 g
Balsam turp    35 g
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