Art Spectrum Gum Turpentine is a natural material derived from distillation of sap extracted from the Pinus Massoniana tree, therefore a natural product. Pure Gum Turps is essentially a crop and there can be colour variances from batch to batch. These variances do not alter the performance or produce any colour shift even with the pale tints of oil colour. Pure Gum Turpentine is a natural, double distilled solvent for oil painting. Used in most painting mediums.