The proportion of antique bronze

Quick answer：

The term 'the proportion of antique bronze' likely refers to the ratio of different materials or components in a material designed to mimic the appearance of antique bronze. In the context of metalworking, this could involve the proportion of copper, tin, and other alloys to achieve the desired color and texture. In art restoration or decorative painting, it might refer to the mix of pigments and binders used to replicate the patina of ancient bronze artifacts.