In an open processor the tissue basket moves and the
reagents are stationary (the old Autotechnicon or the
Ultra Technicon).  A closed processor is where the
tissue is placed in a sealed tank or reservoir and the
reagents are pumped in to them. (VIP, or the like).  

Sheehan's book "Theory & Practice of Histotechnology"
has a whole chapter dedicated to this. 

Vikki Baker
Institute for Cancer Prevention
Valhalla, New York

> Would someone please explain the difference between
> an open processor and a 
> closed processor....
> 


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