[Histonet] acid cleaning slides for silver preps

[George Cole]

Gray's Formulary contains a reliable cleaning procedure for slides:
40 parts saturated aqueous potassium dichromate
Add, with due precautions, 60 parts sulfuric acid.
I always just put excess dichromate in 60 parts water so that much solid
dichromate remained in the bottom of a coverable 
 Container.
Add the 60 parts of Sulfuric Acid, with care.
The quantity of cleaner may be a gallon or so, mixed in a container kept
for that purpose.
Put the coplin jars or other glass ware in the mixture for a few minutes
or over night.  Rinse the glass well with deionized water.
This mixture can be used for a long time.  But the best procedure is
when the solid dichromate is gone, a fresh batch is mixed.  
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