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I can't comment on the green colour, mine appears to be greyish to me but the colour does not really matter as the filter is just to reduce the amount of light getting to your eye, on a nearly full moon I combine my red filter with my moon filter to further reduce the light. The light bouncing off the moon would be most of the spectrum, its just reflected sunlight afterall so by reducing this light to a relatively narrow colour band the amount getting to your eye is reduced. It does not matter what colour that is as the levels are at the "ambient" level and not an artificial level produced by a torch or light bulb which would completely wreck your night vision.
After saying that, looking at the moon will wreck your night vision for DSOs as the light level is soooooo much higher. So a good rule of thumb is to do your lunar observing last, if possible, otherwise lunar observing, then doubles and clusters, then onto the nebulae by which time your eyes should have recovered from the bright moon
Cheers
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