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I would like to make a foam using a cordial, lime juice and egg whites. SHould I add lecithin and what would the portions be? Also what would the effect be if I used 1 charge each of NO2 & CO2?

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I suspect that if you are using egg whites, you won't need to add the lecithin. The egg whites are more than capable of creating a protein-based foam on their own. Using CO2 will give you residual carbonation. I would just use the NO2 (unless you want the foam to be somewhat sparkling). Oh, in fact here is a recipe confirming that just the egg whites are sufficient:

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