1 h and 45 min into cooking colophony, reduction was ~7,5% the first 30-45 min. after that slows down, expecting 10-15% reduction.

Beautiful color as usual... 

24.07.2016, 18:30 Done, link to album: Varnish cooking 24.07.2016

Colophony cooked 4,5 hours

81 g -> 68,5 g

Linseed oil 

69 g

Mastic

18 g

Balsam turp

35 g

Total weight when ready 184 g