Most node setups looks similar to the one below:

Key differences in setup apply to Brass and Bronze, which uses additional color ramps.

Brass

• Physically-Based Color Ramp:
  Brass includes a physically-based color ramp that is already connected to the Principled BSDF shader.
• Additional Color Ramps:
  • Two additional color ramps correspond to the components of Brass: Copper and Zinc.
  • These ramps are combined using a Darken Mix RGB node, allowing you to experiment with alternative appearances.
  • Recommendation: For the most accurate results, use the default color ramp that is already connected, as it is fully physically based.

Bronze

• Approximate Method:
  • Two color ramps, representing the primary components of Bronze (Copper and Tin), are mixed to generate an approximate color value.
  • Recommendation: Adjust the mixed color ramps as needed to achieve the desired appearance.

UPDATES

• 08/12/2023: The Blender 4.0 version introduces slight improvements.