Stiff, dry, meringue-like foam that sits on top of the milk rather than integrating has two causes.
Too much stretching
Every second with the tip at the surface adds air. Five seconds is a cappuccino; ten seconds is a mistake.
A flat white needs 2 to 3 seconds. A latte 3 to 4. A cappuccino 5 to 6.
Count them.
Air added too late
This is the subtler one. Air incorporated after about 37 °C does not integrate into the milk — the proteins have already begun to set around the existing bubbles.
You get large, dry bubbles sitting separately on top.
All the stretching must happen in the first few seconds, while the milk is still cool.
Not enough texturing
Stretching creates bubbles. The vortex breaks them down.
If you stretch and then simply hold the wand still until it is hot, the big bubbles remain big.
Submerge the tip, angle it off-centre, and keep the milk spinning for the rest of the time.
Fixing a jug you have already ruined
Bang it hard on the counter several times and swirl vigorously. That pops the largest bubbles and it will not create microfoam from stiff foam.
The test
Good milk looks like wet paint — glossy, with no visible bubbles, and it swirls as one mass. Stiff foam looks matte and holds peaks.
Last reviewed 8 August 2026