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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Gray’s Formulary contains a reliable cleaning procedure
for slides:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>40 parts saturated aqueous potassium dichromate<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Add, with due precautions, 60 parts sulfuric acid.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I always just put excess dichromate in 60 parts water so
that much solid dichromate remained in the bottom of a coverable <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><span style='mso-spacerun:yes'> </span><span
class=GramE>Container.</span><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Add the 60 parts of Sulfuric Acid, with care.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The quantity of cleaner may be a gallon or so, mixed in a container
kept for that purpose.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Put the <span class=SpellE>coplin</span> jars or other glass
ware in the mixture for a few minutes or over night.<span
style='mso-spacerun:yes'> </span>Rinse the glass well with <span
class=SpellE>deionized</span> water.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>This mixture can be used for a long time.<span
style='mso-spacerun:yes'> </span>But the best procedure is when the solid
dichromate is gone, a fresh batch is mixed. <span
style='mso-spacerun:yes'> </span><o:p></o:p></span></font></p>
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