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Tubed Egg Tempera, Freezing Egg Yolk

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I’m trying to better understand a commercially produced, tubed egg tempera paint made from pigment, freeze-dried egg yolk, gum arabic, and preservative.  Freezing egg yolks (as discussed on various cooking forums) seems to be acceptable if there are additives (sugar, salt); otherwise freezing seems to break the yolk’s natural emulsion.  Any thoughts on freeze-dried yolk as a binder?   Thanks, Koo 

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