I swear I saw a topic on this a few years back, but can't remember to save my life at the moment.

When you have recently laid eggs and candle them to find the egg is roughly half yellow and half red/veiny, do you flip the egg so that the veins are on the bottom or that the veins are on the top? I haven't done it with any eggs so far, but I was incubating a few eggs for a friend and most of them were as I described [none made it, friend claims the female randomly lays eggs (even without being bred, usually all slugs) every year] and was scratching my head if I just flipped them one way I could have saved them.