cornflaking artifact

Greetings to all,
    Would anyone know what "cornflaking" artifact is caused by?  We have a 
Sakura coverslipping machine, and for the past 6 months have found ourselves 
coverslipping and recoverslipping slides that occasionally develop dried out 
spots on the tissue that look like "cornflakes" under the microscope.  Some 
of our bone marrows get a white opaque spot that generally is remedied by 
recoverslipping.  (Although there have been a few cases when recoverslipping 
twice is necessary!)  This is a real drag for busy a.m. time schedules.  Any 
thoughts are appreciated.  Thanks.      

Deb King
Central Histology Facility
Sacramento, CA

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