Grounding

Casein-Lime glue size

Quark (0,3 % fat) 10 g

Lime paste 5 g

Linseed oil  1 g

Quark and Lime paste mixed to an even emulsion. It should smell like rotten fish or ammonia

Linseed oil blended into the emulsion

Varnish

Colophony-linseed oil

Colophony 60 g

Linseed oil 40 g

  boiled for 4,5 hours at 95 °C

  Lime paste 1 table spoon

Pine turpentine 20 g

Cooking ~45 min

1. Colophony heated to 120-150 °C for ~20 min
2. Linseed oil heated to 120-150 °C. 1 table spoon of Lime paste added -> foaming pale yellow
3. Linseed oil slowly added to the colophony 
4. Cooking 120 - 150 °C ~25 min
5. Slowly add heated turpentine to the varnish