Writing on black paper can be done with a variety of mediums, depending on the effect you are looking for.

1. White Pen: A white pen can be used to write on black paper to create a stark contrast. A white pen can be used to create a message that stands out on the paper.

2. Metallic Pen: Metallic pens can be used to write on black paper to create a shimmering effect. Metallic pens come in a variety of colors and can be used to create a unique look.

3. Paint: Acrylic paint can be used to write on black paper. This method can be used to create a bold, vibrant look.

4. Chalk: Chalk can be used to write on black paper to create a chalkboard effect. Chalk comes in a variety of colors and can be used to create a unique look.

5. Whiteout: Whiteout can be used to write on black paper to create a unique look. Whiteout can be used to create a message that stands out against the black paper.