How do you do foils which are underneath and not on top?

How do you do foils which are underneath and not on top?

where exactly do you put streaks? : r/HairDye

brown on top and blonde underneath - Google Search Blonde underneath hair, Brown hair with blonde highlights, Black hair with blonde highlights

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Can I put aluminum foil on my stove top? : r/foodhacks

AUSTRALIA Highlights Top Secret Adventures Case #12455 The Dilemma Down Under

Subtle Rose Gold Bottom Highlights underneath hair, Blonde hair pictures, Hair inspiration long

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FOIL PLACEMENT technique/ which is the best

What purpose does aluminum foil have when it's used to cover the underside of a stove top? - Quora