How to make a foam stay a foam?

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agp

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How can I make a light and airy foam stay a foam without an isi whipper? I plan to make a tea foam in a milk frother, how can I make this foam stay a foam and not quickly collapse? Is soy lecithin the answer?
 
Soy lecithin will help, yes. With milk is easier, because of the proteins that works like a net, especially when they reach 70°C.
 
Soy lecithin will help, yes. With milk is easier, because of the proteins that works like a net, especially when they reach 70°C.

This. But it depends as well. Acid content, fat content, and a bunch of other things can make or break a foam.

For a great and free resource, look at this awesome web book: Texture – Khymos

It is very detailed, but very good..
 
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