Generally, light imprint colors work better on darker products and dark imprint colors work better on lighter products. One thing is for sure, promotional products are meant to get a message across and need to be easily visible. If you choose a color that our art department feels won't show up on the color of product ordered, they will suggest a different imprint or product color. If your order goes to production with colors that won't work with each other, production will not finish running your order and you will be contacted with suggested changes. At the end of the day, we want you to be happy with your finished product and we will take every precaution necessary to make sure that you are 100% satisfied. Happy customers stay happy customers.