Complex sentence: More recent art styles, e.g. art nouveau, also made use of a metallic, shining gold; however, the metallic finish of such paints was added using fine aluminum powder and pigment rather than actual gold.
Split into simpler sentences: More recent art styles, for example art nouveau, also used a metallic, shining gold. However, the metallic finish of such paints was added using fine aluminum powder and pigment rather than actual gold.