Do you mean like when a moire pattern may sometimes appear to have a ghostly coloured after-image? I've seen this in old black-and-white films shown on colour TV. I've been trying to describe that to people to learn more about what it is but I always fail to. I feared there might be something wrong with my eyes. Is there a name for this effect?
For Tv's the colour is caused because the colour signal is hidden as a high frequecy component that older B&W Tv's would ignore. Conversely, a high frequency signal caused by closely spaced light and dark patterns fools colour TV's into thinking there's a colour signal present (as the filters in TV's improved the magnitude of the effect reduced, but it's there to this day in analogue TV).
What you're seeing is probably Fechner Color [0]. I've seen the effect myself, as I recall there was a bit of a craze for demoing it some years back.
