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The following chart provides Diffuse and Reflection Color values that help you create realistic metallic shaders with V-Ray for Houdini:

HideElements
cssselector#tocVertical, #tocHorizontal
 


Name

 

Base (diffuse) color

 

Reflection color

 

Metalness

Base color

(web)

 


Reflection color

(web)

 


 

Red

Green

Blue

 

Red

Green

Blue

Silver

 


0.996078

0.996078
0.992157
 

1
1
1
 

1
fefefd
ffffff
Gold
 

0.984314
0.901961
0.670588
 
1
0.980392
0.764706
 

1
fbe6ab
fffac3
Copper
 

0.972549
0.811765
0.760784
 

0.996078
0.905882
0.847059
 
1
f8cfc2
fee7d8
Aluminium
 
0.960784
0.964706
0.964706
 

0.960784
0.980392
0.988235
 
1
f5f6f6
f5fafc
Chromium
 
0.772549
0.772549
0.772549
 
0.568627
0.556863
0.690196
 

1
c5c5c5
918eb0
Lead
 
0.831373
0.831373
0.85098
 
0.74902
0.752941
0.819608
 

1
d4d5d9
bfc0d1
Platinum
 
0.980392
0.972549
0.933333
 

0.996078
0.992157
0.976471
 

1
faf8ee
fefdf9
Titanium
 
0.988235
0.976471
0.917647
 
0.996078
0.996078
0.980392
 
1
fcf9ea
fefefa
Tungsten
 

0.968627
0.92549
0.886275
 
0.984314
0.945098
0.854902
 
1
f7ece2
fbf1da
Iron
 

0.952941
0.945098
0.921569
 

0.94902
0.960784
0.956863
 
1
f3f1eb
f2f5f4
Vanadium
 

0.980392
0.952941
0.898039
 
0.996078
0.984314
0.94902
 
1
faf3e5
fefbf2
Zinc
 
0.945098
0.941176
0.937255
 

0.960784
0.968627
0.976471
 

1
f1f0ef
f5f7f9
Nickel
 

0.952941
0.937255
0.886275
 

0.960784
0.960784
0.929412
 
1
f3efe2
f5f5ed
Mercury
 
0.898039
0.898039
0.898039
 

0.878431
0.909804
0.941176
 

1
e5e5e5
e0e8f0
Cobalt
 
0.847059
0.831373
0.811765
 

0.803922
0.803922
0.815686
 
1
d8d4cf
cdcdd0
*The RGB values are relative representations. For a better result, use the hex (web) codes from the table.
...

You can try the values with the following test scene: 
 UI Button
colorblue
newWindowtrue
titleDownload Test Scene
urlhttps://drive.google.com/uc?export=download&id=1iANs7ZFrTLKpK_YW6sTqa4onQPboNCuc
...

The Index of Refraction (IOR) plays an important role when creating a physically based material . Therefore, it and has to be considered as part of the shader.  The site RefractiveIndex.info is a great resource for understanding the proper IOR of different materials. However, with For metallic materials (having Metalness value of 1) it is automatically calculated from the Diffuse and Reflection colors: see the Artist Friendly Metallic Fresnel paper. For materials with Metalness < 1, the Fresnel IOR parameter  in the V-Ray for Houdini user interface is not usedfrom the interface is taken into account.
The site RefractiveIndex.info is a great resource for understanding the proper IOR of different materials.
Useful information on metallic surfaces can be found at the Journal of Computer Graphics Techniques site.
For detailed information on the Metalness parameter, go to Understanding Metalness Chaos blog post.
 
 

...

Examples
Below are some examples and their settings.
 Section
 
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width20%

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width60%
 Image slider
 Panel
borderStylenone
Diffuse color (0.7725, 0.7725, 0.7725), Reflection color (0.5686, 0.5568, 0.6901), Glossiness 1
Chromium
 Panel
borderStylenone
Diffuse color (0.9843, 0.9019, 0.6705), Reflection color (1, 0.9803, 0.7647), Glossiness 1
Gold
 Panel
borderStylenone
Diffuse color (0.9529, 0.9372, 0.8862), Reflection color (0.9607, 0.9607, 0.9294), Glossiness 1
Nickel
Move the slider to see the example renders.
 
 Column
width20%