Funny you should bring it up flossy.........I've been looking into inks recently for the same reason.
Black inks used to contain lead, but that is no longer the case except in specialist printing applications (some fancy books I gather). As far as I can tell, modern black ink is almost invariably vegetable based, usually soya. I think black ink is fine in the compost.
It is not quite so simple with coloured inks. They are also contain soya, but have added metallic compounds to get the colours. I am not sure, but I wouldn't be surprised if yellow ink contains chrome.
Anyway, my position now is that no shiny paper goes in the compost, and nothing coloured.