Vertex Color Animation

Hi everyone.

I have a doubt.
I want to animate an object’s color with IPO in game engine, so that when a sensor is triggered, it changes its color gradually.
I know that in game engine have tot use UVtextures and vertex color… but… how could I do this?
Is there any “vertex color key” to edit in IPO curves editor?

Sorry for my ignorance. I’m trying to learn.

Thanks in advance.

Yes it is. It is ColR, ColB, ColG, ColA.
An example you can find here:
http://gameblender.wikia.com/wiki/Particleflame

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