> "using the pigment as shown, I get the single decal but the other texture has
> turned transparent and the droid looks like a weird mix of glass and (white)
> emissive media."
>
<http://news.povray.org/povray.bugreports/message/%3Cweb.5de6653248df159ffeeb22ff0%40news.povray.org%3E/#%3Cweb.5de6653
> 248df159ffeeb22ff0%40news.povray.org%3E>
> 
> for this image I scaled the decal down to show the effect.  it looks like much
> of the 'finish{}' survives in 3.7.1, just not the colour.
> 

That droid obviously have an interior that set an IOR. We see a fair 
amount of total internal reflection.
When applying a decal, you should layer it over some other texture.

#declare textureWithDecal
texture{SomeBaseTexture}
texture{pigment{image_map png"Decal"once}}

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