Thicker stock, card

After using some thinner stock i felt that using card could be a better option for the packaging as it would hold the product more securely. However using this material to print onto i have found the image becomes more dull especially when yellow is printed onto it. As one of my characters colour is prodomatley yellow i will have to change it to a more appropriate colour.
I have found when putting the net together scoring the card with a bone on the inside makes a neat score where as scoring the outside teared the card.