Please check the procedure below :
1) The heating temperature shouldn't more then 1200 celcious in order to get the stable quality.
2)For your information, it is not necessary to set the NANO into the wax to see the effect. You can just place the stone in the furnace by itself and see it on the next day. If it change color, mean it is not stable.
3) please check whether the casting department has change the "Casting powder" on that "Burn" case. The casting powder should use the "Wax casting" powder.
4) After Casting, the cooling hour have to remain longer then normal, try 2 hours, other wise, it will show the whitish light Gas bubble everywhere over the stone.
Anyway, We will replace another badge of sample to you soonest possible.