Colours will appear different on this coloured paper than when printed on a white paper.
We do not "print" white ink (although we do offer white foiling or silk screen at an additional cost). Elements in your design that are white will end up being blank (hence showing the green paper).
The paper stock will also affect the way that colours appear. Colours in the green, yellow, cyan spectrum will tend to not be visible as the green colour of the paper will not contrast enough with the ink. This is also the case with light and pastel colours.
As the Green Kraft is textured it does not hold fine detail.