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How do I know what shade of Mac foundation to get?

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ok i want to buy mac studio fix powder plus foundation but they are sooo many shades i have no idea which to buy, i cannot try on first as no where in my city sells it and i cannot travel to buy so i have to get it online, i usually get ivory but it goes a little orange with powder and foundation but with this mac foundation i don't think i need more powder it will just be the foundation. But i'm not sure on shades :/ Could anyone help?