i ask this due to re watching the original naruto show. and constantly in the beginning they remark on how chakra is normally invisible. so it was insane when narutos red chakra was visible and (for some reason) kakashi used chidori (which produces lightning so it should be visible anyway).
then naruto didnt even notic the ball of chakra in Jerias hand when he first showed him the rasengan. but after that it seems like everyone can see chakra with out issue.