awesome!!! i don't have an ant problem...but it's nice to know the solution thanks for that heads upI use semolina, cinnamon only deters, semolina kills.
It's the flour used to make pasta so it's harmless to everything other than my waistline. The ants eat it, it expands and they explode. Kills whole colonies in a couple weeks as they feed it to the queen.
As for the danger, I wouldn't worry about it so much. I've had ant nest form between my observation window and the cover and on top of my top bars many times. The bees always keep them out of the hive, but they are annoying and so I got rid of them.