Clean the lampshade with a damp cloth. Pat dry with a soft towel.
Make a mixture of one part acrylic paint and two parts clear acrylic medium in a disposable dish. Stir thoroughly with a paint brush or paint stick.
Apply a test patch of the paint mixture to a small portion of the red lamp shade. Assess the color; if you don't like it, wipe it away with a damp cloth before it dries. Adjust the ratios of white paint and clear acrylic as needed and try new test patches until you get the pink color you want.
Paint the lamp shade with a large house painting brush. Use long strokes that move from the top of the shade down to the bottom.
Let the lamp shade dry for three to six hours.