Wallace Seymour's range of auxiliary materials (mediums, varnishes and solvents) have been selected to combine tradition and innovation. At a time when natural materials have become scarce, expensive and hard to find, Wallace Seymour intends to continue to offer these niche products at sensible prices. Wallace Seymour products are all laboratory-tested and trialled in-house by artists.

Wallace Seymour's Shellsol T is a low-odour mineral solvent which is a popular alternative to Turpentine. It can be used to clean brushes and to dilute oil paints or mediums.

If used to dilute paint or mediums, Shellsol T will evaporate over 6 to 8 hours, leaving no residue on the paint film. This product is almost odourless, but it should only be used in a room with adequate ventilation.