These are triglyceride-based, and include cooking oils like canola oil, solid oils like cocoa butter, oils used in paint like linseed oil and oils used for industrial purposes.
This line includes thinner, linseed oil, safflower oil, stand oil, painting medium, fast drying medium, and impasto medium, as well as gloss varnish, matt varnish, satin varnish, and varnish remover.
Their compositions were similar: 25-35% asphalt and 10% linseed oil with lead and iron-based dryers, dissolved in 55% thinners (mineral spirits, turpentine substitute or naphtha).
The function of linseed oil as a preservative is believed to be related to its action as a water repellent and drying agent rather than a direct biocidal activity.