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I LOOVE french tips! They`re so simple and cute at the same time. It looks great with any colour as the tip. I honestly like using white though because it looks more clean and simple. I normally try to find cheap alternatives for white nail polish but I think the best white nail polish for me is OPI`s white alpine.
For this DIY all you really need is nail polish(es) and paper reinforcement. It`s a lot cheaper using paper reinforcements than buying the french style nail tips guide stickers AND in my opinion, I find that it works a lot better. You could also always cut the paper reinforcements in half too!
Good luck with this DIY!
*picture is not mine