Nectar getting dark
I'm feeding hummingbirds for about 6 months now, and never had this problem.
I'm making the nectar myself - just use 4 parts of water to 1 part of sugar. But now, after I change the nectar, next day it gets dark, of some yellow color.
I don't know what's causing this. Same sugar, same water. And it's cool now, it was much warmer in the summer when I didn't have this problem.
I even bought a new feeded, I thought perhaps I couldn't clean the old one well enough - didn't help.
I would appreciate your suggestions.