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White marks on Final Pieces

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Hi, I am new to this forum and if possible, would like to have some advice.
I fired a group of sculptures on my new electric kiln (third fire),  and most of them have come out with 'white spots'. I am attaching photos so you can see them.

I  bisque fired them them to 1000 c  The clay I used was: Valentine Clays.  ES 180 Sculpting/Pizza Clay.
I wonder if it is the clay or the temperature of the kiln.

Any advice?

Untitled copy.jpg

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