Archival Odourless Mediums and Solvents are based on fast drying alkyd resins which out perform ‘traditional’ mediums and are better for health. They evaporate much more slowly than turpentines so that very little vapour is generated during a painting session.
The main reason why artists develop allergic reactions to oil painting, is not because of the paint but because of the toxicity of traditional mediums. Oil paints are relatively non-hazardous in themselves.
Traditional mediums evaporate very fast releasing toxic vapors which cause health problems. Aromatic solvents like gum or mineral turpentine will affect your health with years of regular use because you cannot escape the fumes. Using toxic solvents and mediums in public shared spaces is like passive smoking. Ultimately it is best to avoid these types of solvents.
All of the Archival Mediums use low toxic odourless solvents.