So, my son is in Preschool 4 mornings for 2 hours.
They said during orientation that the rule is "if it's clear let them come. If it's yellow/green keep them home" referring to their mucous.
He's like a mix of clear and yellow. It's definitely not like solid yellow and opaque or anything. And he's 100% fine. Just a little sneezy and runny, but same cheerful demeanor. No fever. No cough.
It's day 4 of his cold.

Would you send? Of course I want to because that's some precious time to myself, and he loves it and seems fine. But I don't want to be the a-hole disobeying rules and getting everyone sick (though I'm sure he got it from school anyway so, whatever).
ETA: he's rarely sick that's why I'm not really sure what to do! Somehow this kid has had so few colds I could count them on my fingers.