Cute chick Goldie!
I leg banded all my legbars with zip ties about a year ago. I'm not sure what happened, but only one hen still has her zip tie on. They are all molting and I can't tell them apart anymore.
When I mark my chicks I have used food coloring and zip ties. It seems like the zip ties need to be removed/replaced every two weeks. Their legs grow so quickly that any longer than that you run the risk of damaging them. Food coloring on the head lasts 2 -3 weeks, and on the body it last 7 - 10 days. I prefer the food coloring to zip ties. Applying new food coloring every 2 weeks is a lot easier than putting on new leg bands.