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