ANSWER:

If halal food was contaminated directly with haram food, this becomes najis as well.

I know that if halal and haram food are cooked together it is harm.in a bakery run by non Muslims,if I am pretty confident that meat items and stuff like plain buns are cooked speratly, will a plain bun be haram if it is served/sold with the same spatula used to serve a meat based bun,what I am trying to ask is wil halal food be haram if merely touched by haram,like by the fat particles e.t.c.