Colour on a grey day

This is a completely untouched out-of-camera shot and went nowhere near photoshop unlike yesterdays blip.

I was breaking up some glass off-cuts so I could take them to the tip.  This small piece of anti-reflective glass fell in a puddle and I was amazed by the colour.   Of course,  the glass isn't actually that colour,  the colour is caused by interference reflection in the metallic coating which is what suppresses the reflection.   I think the dull grey conditions just boost the false colour