I guess you could just set every entry in a palette to white, but then every object would need it's own palette. Which might be wasteful and a bit a horror to code..
The other Idea I have would be to render out exactly this for every animation frame. Which would double the amount of data needed for every object. Also a bit wasteful..
So, is there a more clever idea than what I wrote how to do this?

How was this done on Pulstar and Blazing Star, for instance?
Thanks,
Tigerskunk