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How to Steam Milk for Latte Art (2026 Guide): Step-by-Step + Science Explained Tools: Cold milk (4–6°C), a stainless pitcher, and an espresso machine with steam wand. Stretch (Aeration): Place the wand tip just under the surface to introduce air (listen for a gentle “hiss”) for ~2–5 seconds. Texture (Whirlpool): Submerge the wand and tilt the pitcher to create a vortex. This mixes and breaks large bubbles into fine microfoam. Temperature: Steam to 55–65°C. Stop when th