"During the 1980s Salt moved away from using acrylic paints to using water-based casein, largely for health-based reasons rather than as a question of style.His work also continued to broaden in scope, with an increasing emphasis on the landscape and context of his subject matter, to the extent that in some later works such as "Catskill Cadilac" the subject is "not so much sinking into the landscape as being hidden by it".