This section is from the book "Chromatography; Or, A Treatise On Colours And Pigments, And Of Their Powers In Painting", by George Field. Also available from Amazon: Chromatography, or A Treatise on Colours and Pigments, and of Their Powers in Painting.
Spirit Of Wine or Alcohol, is weaker and more dilute than essential oils, or even than water, and is so volatile as to be of use in vehicle; only as a medium for combining oik with resins. etc. - as a powerful solvent in the formation of spirit varnishes, and in some degree as an innocent promoter of drying in oils and colours. In pictur-cleaning it affords also powerful means of removing varnishes, etc.