You have to use glossy - the regular US white will get too wet and curl up. Also, make sure the ink is on top of the bubbles - ink that is in the bottom of the bowl won't color the cardstock adequately.
Some colors work better than others - most of the pinks are too light to see, except for maybe Pink Passion. Brilliant Blue works really well (almost too well) and seems to sit on top of the bubbles moreso than the other colors (weird, I know.) I've had good luck with Brocade Blue and Lovely Lilac.
Julie
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