So the dome part was down in
So the dome part was down in the mould?
Yes you need to get all the separator off. If it is a simple domed piece, you can fire polish it. Take it up to about 50C above the annealing point slowly, maybe only 50C/hr. Then go really fast up to about 740-760C (you will have to peek to determine when the surface becomes shiny again) and then proceed to the normal annealing schedule.