Using bold colours on your box will always result in a great overall finish. This is because the more solid your colour choice the more it will stand out against the cardboard surface on which it is printed.
It’s also important to remember bright colours will appear bright and bold printed on Clay/White material but slightly less so when printed on Kraft/Brown material. When deciding on bold colours for the Kraft/Brown range darker shades will work better – black, dark green, maroon and similar.