Blache belonged to the younger generation of Denmark's classical marine painters but had studied under one of the earlier masters, C.F. Sørensen. Like his colleagues, he had a good knowledge of ships and chose subjects mainly from home waters and coasts. He travelled through the whole of Denmark, painting many acclaimed works of the west coast of Jutland. Some of his more dramatic paintings depict scenes of stormy weather. He travelled to Paris in 1878 to see the paintings in the World Exhibition. His paintings include scenes of Skagen, Scotland, the Faroe Islands and Iceland.