The base coat of colored Nail polishes must usually be colorless, i.e. transparent, so that the colored Nail polish on the back can bring out the color better. There are also some base oils with some color, such as light pink and light blue. In fact, this type of Nail polish is almost invisible when applied to the nails, but it is also possible, but do not use the type of Nail polish that is visible when applied, as this will affect the color saturation of the later applied Nail polish.
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