Ducky wrote:@Pontoonrider
I prefer to prepare more yolks in one time than do it everyday too.
In the fridge mixed with sugar its still good after 4 days.
Maybe more i dont know i always eat it in less than 4 days.
No, they don't. And whether or not you put sugar in it won't make any difference. Since you eat some of it every day, it will definitely come in contact with oxygen every day, and so there will still be oxidation even if you cover the cup where you keep them in the rest of the time. Also, fridges are loaded with bacteria. Once the yolk isn't protected by the sack anymore, it will turn bad very fast.