Check the Cornell univ web site you should be able to find where th red dye is bad
zincgt wrote:
I cheat, as there are 35-40 feeders in my complex here, and the competition is very great for the birds time. There are a lot of them, but to get the feeding time I do use the red food coloring, as it is harmless. I also use 1/3 cup sugar to 1 cup water for a higher content mix.