[Histonet] Victoria blue Stain

[Rohgi Ani]

 hi, im rohgini, medical lab technlogist. im a bit confuse with victoria blue preparation steps and can you please expain more details about the protocol specially the step i meantioned below.
"After cooling filter it. Dry the filtrate on the filter paper in a 56øC 
oven until completely dry. Dissolve the dried 
filtrate in 400mL of 70% alcohol."Thanks alot :)