Quoted from cody_chunn:So one might could even suspect that a screen marked "white" actually had cream squeegeed through it...depending on the manufacturer and if maybe they had a lot of leftover ink from a previous job that was 'white enough'.
No way, not even vaguely likely as a scenario. Screening a white base coat is pretty much the most basic thing in the world when it comes to printing, every single color you print over it is going to be affected. No way someone goes "eh, it's lightish, let's just use this instead".