Dilute malachite green:  a background stain for the Millipore filter.
D004396:Coloring Agents; D006801:Humans; D008851:Micropore Filters; D012394:Rosaniline Dyes; D013194:Staining and Labeling
D004396:Coloring Agents; D012394:Rosaniline Dyes; C005095:malachite green
STAINS AND STAINING