[Histonet] Variation in staining

[Martin, Gary]

In the last two days we have noticed a problem with our sections having
areas that do not take up the Hematoxylin. This seems to be geographic
pattern that varies at different levels.  For example one level on the
same slide may show this effect, while the next level will be fine.  The
Eosin is not effected.  We have had no changes in our processing. 

I did search the archives but was unable to get results. 

Thank you