@killercool Toxicity seems to vary. Some cause convulsions and breathing problems (very toxic) while others would be used as sweet snacks by children (back in the days when they'd learn the difference, one way or another). - https://abritishprofinjapan.blogspot.com/2017/05/rhododendron-azalea-tsutsuji-satsuki.html
(Of course, in this story it might also be a translation miss, or a mangaka miss. I found several places selling "powdered Azalea food coloring" on a quick websearch, but I don't know if any of those actually have azaleas in them.. hopefully it's just a poetic color name..)
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Either way, I also give thanks to the translation (team?) for the hard work and for picking this up.