How come dark blue nail polish stains my nails?

How come dark blue nail polish stains my nails,because put dark blue nail polish on about 2 weeks ago then i took it off,and my nails where stained,what caused this??How come dark blue nail polish stains my nails?
You need to use a clear base coat first, then your polish.How come dark blue nail polish stains my nails?
May I suggest using hydrogen peroxide to remove the stains on your nails.

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2 weeks ago??? gosh that must be a very good brand of nail polish to last 2 weeks on your nails.....


you should remove it after a week or so to prevent staining and getting yellow nails