Material advice - Oxidised Copper

[Stirling]

I need to produce the pictured material which is an oxidised copper. It seemed like it should be simple enough but I've had a number of goes at it but can't seem to replicate the images. Currently on a building I'm working on it's a single face but am thinking that I may need to split it up into individual panels and apply noise to each one given that the panels aren't perfectly smooth.

I'm aware that I need to improve my material creation and have enrolled on Grant Warwick's course but I've barely scratched the surface of that, never seem to be able to squeeze any time for it!

Any help greatly appreciated.

[Rens]

The image on the left is the reference? It's not easy to tell from the tiny image but it looks like rough copper material (coloured reflection) as a base, and then a smooth reflective coating on top.

You can do this with three materials and a map:
- Create a VrayMtl, disable Fresnel, and place a brown colour in the reflection, have the same colour but darker in the diffuse. Adjust glossiness, say set to 0.5.
- Create another VRayMtl, disable Fresnel as well and set the reflection colour to white. Set glossiness to 0.95.
- Create a Falloff map, or another map where you can output reflection curves, and set it to Fresnel mode.
- Create a VrayBlendMtl, set the brown metal material to the base mtl, and the white reflective material as the coat mtl. Then set the Falloff map as the coat blend map.

If it's just a smooth copper material that you need then you can use just the first VrayMtl and then set the glossiness to for example 0.95.

[Stirling]

Can't work out why the photos are showing as thumbnails. Have uploaded as jpgs to see if that made a difference but it didn't. Link added to the originals for reference. All three images are reference images by the way.

About to have another go with your suggestion Rens, thanks for the advice.