storing controls

From:Michelle Peiffer <>

Thanks to all who responded about my IHC decreased staining post.

Several people have mentioned storage of the controls.  Some are purchased
slides, so obviously they are precut and they are stored in the
refrigerator.  But most are freshly cut from blocks which are stored at
room temperature.  I was under the impression most people store blocks at
room temperature, is this correct?  How long can controls last?  We just
started doing histology so our oldest blocks are only 6 months old.


Michelle Peiffer
Electron Microscope Facility for the Life Sciences
Penn State University Biotechnology Institute
001 South Frear Lab
University Park PA 16802

phone: 814-865-0212

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