Yes, with our in-house foil stamping machine we can print opaque white and other light colors on black (or any color) paper! Unlike foil pigments, letterpress inks are translucent, so light color inks don’t show up well on dark or saturated-color stocks, though some letterpress inks like silver can work on some paper stocks (we can show you some samples or set up a press check to confirm the best option for your project).