Just spent ages and big quantities of ingredients on making my DSs 16th birthday cake and the last egg I broke in to the mixture had a bright neon yellow/green colour to the egg white . I'm going to have to chuck the lot and start again. Problem is I need to buy more eggs etc and his birthday is tomorrow . Google isn't giving me a definitive answer so I think it's safer to chuck it .
I had a similar egg the other day, no idea if it was bad or not (it didn't smell) but I threw it away anyway. I wouldn't risk eating it though. Incidentally is your fridge turned up high? Someone helpful had turned mine up and so I thought it might have been that that caused it here.
It didn't smell, but didn't want to risk it anyway. Finally got a cake made earlier after trip to the shop for eggs etc. I do normally break eggs into a cup first but late night rushing meant I failed to do that!