You've definitely clicked the right instructable. You've probably got everything you need to do a gorgeous gradient manicure right now! Keep clicking to see how to achieve this!
Step 1: Supplies
White nail polish
Nail polishes for the gradient in the colors of your choice
A cosmetic sponge
You can use any polishes you like for this, but keep in mind that you're going to be applying a very thin layer of the gradient colors. Opaque polishes tend to work a bit better for this than sheer polishes.
The white nail polish isn't exactly a requirement, but it definitely makes the gradient colors show up better.
As for the sponge? You can use pretty much any kind of sponge you want, as long as it's clean and doesn't melt if you put nail polish on it. If you aren't using a cosmetics sponge, you might want to test it by putting your nail polish onto it and stamping it a few times onto paper to see if it holds up. If it does? You're good to go!