White works. It took about 15 minutes to refill the pen. Black worked once and never again. The reviews weren't great so I researched You Tube and watched Dian Reveley's video on how to use them. Previous buyers were right, these pens are junk. As an aside, I really wanted colored pencils, but from my own experience, you don't need pencils. Spray a small amount of ink on your drawing sheet and use a water brush. This does the same. You can mix colors, saving you money.
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