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📘 How Far Does a Marinade Really Penetrate?

You open the refrigerator at midnight and find a glossy chicken breast in its bag. Garlic, lemon and oil coat it, but the centre is still itself: a marinade meets the surface first, and diffusion decides what gets farther.

4
lessons
~20 min
to learn
Adults
level
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What you’ll learn

  1. The wet outside is not the insideExplain diffusion, penetration depth and why cut thickness determines whether a marinade can flavor the centre.Most aromatics move only through the outer few millimetres of thick meat. Thin cuts make that layer meaningful.
  2. Salt is the travellerDistinguish salt diffusion and protein effects from the limited movement of herbs, spices and oil.Salt benefits from a concentration gradient and time. Dry brining is a more direct route to deep seasoning than adding more liquid.
  3. Acid changes the surfaceSeparate acid's surface texture and pH effects from the myth of deep tenderization, and explain oil's role.Acid modifies reachable proteins; oil coats and carries fat-soluble aromas. Neither makes a thick cut uniformly marinated.
  4. Design for the distanceUse thin cuts, exposed faces, dry brines and safe handling to make the reachable layer count.Choose the cut, reserve clean sauce, refrigerate, discard used liquid, dry before browning, and cook by temperature.

Questions this course answers

After an overnight soak, where do most chopped herbs and spice particles remain on a thick piece of meat?

Large aromatic molecules and particles move very little through intact muscle. The reachable zone is usually shallow, while thin cuts can make that zone meaningful.

In one 18-hour kitchen test, how far did visible marinade colour reach into a thick chicken breast?

That test found visible colour in about the outer three millimetres, not a universal depth. The result varies with cut and ingredient.

Match each component to its main job in a marinade

Ingredients do not all travel the same way. Their chemistry determines whether they dissolve, coat, react at the surface, or remain particles.

Put these steps in the safest useful order for marinated chicken

Keep a serving portion clean, marinate cold, discard contaminated liquid, and rely on cooking for pathogen control. Acid is not a substitute for heat.

Why might you butterfly a chicken breast before marinating it?

More marinade does not make an intact slab thinner. Changing the geometry does.

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