The brilliance of Canada Balsam combined with the rapid drying rate of a soft resin and the hardness of the Copal concentrate produce a marvelous painting medium.
Ingredients:
| 2 parts | canada balsam | |
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| 2 parts | double mastic | |
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| 1 part | copal concentrate | |
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| 1 part | stand oil |
- Stir all the ingredients together in a double boiler over heat until the balsam combines with the other ingredients.
- This produces a fairly heavy medium which can be diluted with turpentine or, better yet, Lavender Oil of Spike.
How to use:
This medium can be thinned with turpentine and used as a final picture varnish. A. P. Laurie suggests that this painting medium very closely resembles the characteristics of the medium used by Jan Van Eyck. This formula dries in 1 1/2 hours.
