...and I've just added a second band to half my birds, the stripes were wearing off. Thank you @aart, I'd expected better - while still obvious, signs of wear were already present.
I still won't drink a Pepsi! ;)
Very best to you @aart, hope you have a great morning. I need another cup of hot poison before I start weighing my birds, updating photos, and replacing leg bands.
No, most of my sharpies are dry erase. This is the one i use to mark plastic bags used for long term freezer food storage and the like.
/EDIT - See below, stripes were fading. Not a long term solution
I'm also using colored leg bands (4") for my birds, though I have moderate numbers, not in the 100s. Left leg is hatching, right leg is the "bird band". I do use a sharpie, not to write numbers, but to add stripes.
Green Solid, Green Stripe, Orange Solid, Orange Stripe, Pink Solid, Pink...