Oh dear - one of my little ones that went into it's Chrysalis immediately changed to black when this happened.
I looked this up and apparently what may have happened is despite my best efforts, a mite may still have got to the catepillar or something called pseudomonas happened (which is a bacteria that infects the caterpillar). My heart is just sick at this happening to any one of my catepillars, but this is something that does happen, so I have to accept this. I am still going to wait a few days before I put the Chrysalis to rest, just to be certain.
MNN
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