The term "more cuprous" is often used to describe the reddish-brown color of copper or copper-based alloys. There are several synonyms one could use to describe this hue, such as coppery, bronzy, russet, or tawny. Each of these words evokes a warm, earthy shade that brings to mind the natural beauty of copper. Other synonyms for "more cuprous" might include maroon, terracotta, or brick, depending on the context of the description. Ultimately, the choice of synonym will depend on what qualities the author wishes to convey, such as richness, warmth, or earthiness.