It remained grey without any apparent changes for at least 5 more days. But on the morning of the 16th July, the grey had turned black and I was worried that the fly would emerge during the night but when I checked it the next morning (17th July), I saw that the pupa was still intact. I decided to keep a watch over it all day. @ 8.14 am: the pupa has now turned very dark and looks like it is just about to break up.
