Citrus Solvent (d-limonene)
An all-natural way to thin drying oils such as tung oil or linseed oil, as well as pine tar. Will evaporate as it dries. Can also be used as a concentrated cleaner or degreaser. Has a strong but pleasant citrus aroma that is harmless, and is non-toxic and biodegradable.
Citrus Solvent is an excellent direct replacement for the more toxic paint thinner and mineral spirits.
See the Real Milk Paint website for more info.