These RSVP envelopes turned out beautifully. We printed white ink on the straw Kraft colored envelope which is like a natural color. On the final envelopes, the contrast between the white ink and the color of the envelopes was not as good as I had hoped, just because the color of the envelopes was not very dark. But- they made it through the mail just fine, even though I was worried! (Just remember to put extra postage for the white ink)