You've Probably Never Heard Of The Seasoning Movie Theaters Use For Popcorn - Tasting Table
Briefly

For those who cannot replicate that genuine movie theater experience with homemade popcorn, using Flavacol seasoning salt can bridge that gap, providing the desired flavor and texture.
Flavacol contains just a few ingredients: salt, artificial butter flavor, and food colorings Yellow #5 and #6, which help ensure even coating and a visually appealing product.
Most movie theaters use butter-flavored oils instead of real butter, relying on seasonings like Flavacol to create the hot buttery taste that consumers associate with their favorite snack.
Flavacol seasoning salt, used since the 1960s, enhances popcorn to give it that classic irresistible movie theater taste, achieved by its unique fine flake salt.
Read at Tasting Table
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