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Im using Maybelline Mineral concealer for months and i like it so far. It costs around 10 euros and u can find it on drugstores. My color its 01 Nude Beige and it matches my undereye area perfectly.
It has a decent coverage, u can build it if you feel that its not covering your dark circles enough and it lasts about 6/7 hours without retouching.
I wont say thats the best concealer in the world, cause its not, but its a really good concealer if you dont wanna spend much money.
I`m happy with this i dont feel that i need a better one, so i will keep buying it!
(image from link below)