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Step 4Mix in Vinegar and Water
Now we need to add the vinegar and water to the yolk. The vinegar keeps the egg from quickly spoiling. It will still go bad, but you will have several hours of working time before it begins to stink.
I was told the proper measurement is 1/2 eggshell of vinegar, and 1/2 eggshell of water. I did it with the eggshell, which leaked vinegar all over me. No surprise there. Next time I'll use a teaspoon. I think the idea is to just slightly cover the top of the yolk, so it isn't exposed to the air.
NOTE: On eggtempra.com the technique is a bit different. They don't use vinegar, probably because it is acidic and I think that can effect the archival quality of the artwork.
I was told the proper measurement is 1/2 eggshell of vinegar, and 1/2 eggshell of water. I did it with the eggshell, which leaked vinegar all over me. No surprise there. Next time I'll use a teaspoon. I think the idea is to just slightly cover the top of the yolk, so it isn't exposed to the air.
NOTE: On eggtempra.com the technique is a bit different. They don't use vinegar, probably because it is acidic and I think that can effect the archival quality of the artwork.
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Boy was I confused. I was trying to figure out how to store egg white.