BERT 75 days old !!!! Change has come. So excited

I THINK his Amniotic fluid burst. His water broke and that's what is making him black.

Something has happened. Could it be true? Could this be it? Could Bert be changing into a butterfly?  His little wood Sarcophagus has turned black.
I read that they do this when they are about to emerge.  I hope it doesn't mean something else!

See the pics and send wishes to Bert?