The painter's companion; or A treatise on colours. [electronic resource] : Shewing how to make the several sorts from their proper ingredients; together with the best method of colouring maps, prints, views, &c. The whole being practical improvements on the experiments of the Honourable Robert Boyle, Esq; very useful for gentlemen and ladies that amuse themselves with painting in water colours, as well as designers, limners, &c.