An essay on the mechanic of oil colours, [electronic resource] : considered under these heads, Oils, Varnishes, and Pigments, with respect to their Durability, Transparency, and Force, In which is communicated some valuable Secrets, particularly, A Method of preparing the Oils, So as to give them a strong drying Quality, perfectly limpid and colourless; A finishing Oil Varnish, And other useful Vehicles for every Branch of the noble and liberal Art of Painting, pointing out The valuable and pernicious Qualities of certain Colours, with a Recommendation of such as are known by long Experience to stand well. By an Artist, Who has been Thirty Years in incessant Observation and Practice.