I use the 4-1 recipe also, cook it a little, and I don't use coloring. 2 of the 3 feeders have red on them. I just hang them on the eve, so when it's sunny, they're in the sun. When it's hot out I have to change the juice more often if there's any left because it will go bad.
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Propping up an obsolete fishing industry at the expense of sound fisheries management is irresponsible. -Sg