I just used what I'm assuming is a pure gold ring from a great, great, grandparent. Tied a thread to it and just let it hang as still as possible abo e the chick. This time around, the results were odd. The ring swung one direction first and then indicated the opposite on a few of the birds. I have since researched if gender can change during incubation and it can if certain conditions are met . Not sure if that's what we had but my incubator went cold on 3 separate occasions with this hatch...and to get it back to temp, also got a bit hot a few times. So I'm wondering if the gold ring and any sort of magnetism/energy associated with it really is interacting with something specific to a chick's gender, if some of our chicks had changed...as in their DNA says they're one gender but their body obviously developed into the other. Wish I'd documented which ones confused the ring and what order it moved in. Next time!