What's the Difference Between Milk Foam and Milk? Why Can Milk Be Turned into Foam?

FrontStreet Coffee often says that a latte does not taste better just because it has beautiful latte art, but latte art does give the drinker more to enjoy, adding visual pleasure. So many people practice day and night to create exquisite latte art.

Creating beautiful latte art requires the barista to master the technique, but the quality of the milk foam matters just as much. Before learning latte art skills, then, the more important thing is to learn how to froth milk foam for latte art. So what kind of milk foam is most suitable for latte art?

1. Possessing Fluidity

When it comes to what kind of milk foam is most suitable for latte art, it is definitely foam with fluidity. If you want to create more than just basic patterns like large hearts, the foam must have high fluidity. To achieve this, you need to control the thickness of the foam, because the thicker the foam, the lower the fluidity, and the thinner the foam, the higher the fluidity.

Being too thin will not work either, because if the fluidity is too high the patterns easily float and become unstable during pouring, so the foam should be appropriately thicker, a thickness of about 1cm being sufficient. Foam thickness is mainly determined by the amount and time of aeration during frothing. Although many people understand the principle, quite a few still perform multiple aeration steps without meaning to, for example suddenly hissing a couple of times during texturing to increase the foam thickness. Here FrontStreet Coffee shares a small technique to control aeration: leverage.

Find a fulcrum between the milk pitcher and the steam wand and use it to steady the pitcher, so that during frothing you do not need to rely on your own strength to hold it steady, naturally avoiding accidental aeration caused by a shaking hand.

2. Fine and Smooth

Fluidity alone will not let you create satisfactory patterns. If the foam is too coarse and separates from the milk too quickly, you still will not be able to create beautiful patterns.

This makes the texturing time very important. After aerating, immerse the steam wand into the milk to form a vortex, letting the vortex use suction to draw in and cut those large bubbles into countless tiny ones. The longer you texture, the finer the bubbles become; the shorter the texturing time, the coarser the foam. How can you judge the quality of the foam? This is simple: hold the foam against backlight and see whether it reflects light like a mirror and whether it has a rich luster. If not, the foam particles are rather dry and coarse. In that case there is still a chance to salvage it, for example by pouring between pitchers or shaking to eliminate coarse bubbles.

Then pay attention to extending the texturing time next time you froth. If the heating speed is too fast, causing the milk to reach the target temperature before the foam has time to become fine, lower the milk's starting temperature by refrigerating it, or reduce the refrigeration temperature, to increase the texturing time.

3. Not High "Moisture Content"

Although the texturing time should be extended, it cannot be too long, because heating milk foam relies mainly on water vapor, and its addition not only heats the milk but also dilutes it. If the frothing time is too long it adds too much water to the milk, not only diluting the concentration but also making the foam more likely to atomize during latte art, producing the kind of complete mess shown below.

Layering can also cause messy patterns. Observe the milk foam that blends with the coffee: if it has sufficient fluidity but also shows atomization, it is very likely due to too much moisture, since layered foam does not have high fluidity. If that is the case, you can control the refrigeration temperature of the milk to shorten the texturing time, thereby reducing water's damage to the foam's stability.

So these, in FrontStreet Coffee's view, are the qualities milk foam suitable for latte art should possess: high fluidity, fine and smooth texture, and not too high a moisture content. As for frothing techniques, interested friends can search FrontStreet Coffee's official account.

FrontStreet Coffee Recommendation

Once your foam is smooth, fluid and stable, the bean you pair it with shapes both the flavor and the look of the pour. For anyone learning latte art at home, FrontStreet Coffee suggests starting with the FrontStreet Classic Blend, a medium-dark espresso recipe drawn from three regions and inspired by the old "Mamba" combination of Mandheling and Brazil, with a little Robusta added for aroma and crema. It extracts with clear butter, toasted bread and caramel-biscuit aromas, tastes strong and solid with a fine crema, and pours very consistently, which makes it a reliable everyday bean for practice.

If you prefer a nuttier, richer style, the FrontStreet Premium Blend is another medium-dark espresso option, built on the classic pairing of Colombian washed coffee and Brazilian semi-washed coffee. It shows nut, dark chocolate and caramel, and whether you make an Americano, a latte or a flat white, it foregrounds a smooth cream, almond and cocoa character with crema that stands up to café output; the recipe is forgiving enough for latte art practice and is aimed at both home learners and anyone planning to open a shop.

For those about to open a café, the FrontStreet Commercial Blend is designed for volume. It builds on FrontStreet Coffee's Premium Blend with a little Robusta added, in the traditional Italian style, to produce more fine dark-brown crema and a heavier body, so an Americano, latte or mocha all carry nut, cocoa and caramel notes and the milk pours into patterns with a reassuring ease.