You will need: black nail polish, 4 acrylic or water color paints, a brush, water, and a top coat.
Start with a base coat to protect your natural nail.
Paint your nails black.
Take your paints and thin them out using a few drops of water.
Using your brush paint on a few dots of watered down blue.
If the dots are too thick, add some more water to the dot. This can also add a cool streaking effect if you let the water drip off the nail!
Do this with the other 3 colors and to the rest of your nails!
Add a top coat and you're done!
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The creator of this guide has not included tools