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The Methods and Benefits of Staining in the Microscopy of
Consumer Products
Tom Kremer
DuPont Fiber Identification Stain No. 4
Acid Blue 298
Acid Red 182
Direct Blue 218
Disperse Orange 25
Disperse Yellow 3
Color Reactions
Nylon – red to reddish brown
Rayon – blue to blue-green
Cellulose acetate – orange
Polyester – pale yellow/yellow tan/beige
Acrylic – beige
Olefin – light tan to pale yellow
Color Reactions (contd.)
Wood pulp (chemically treated) – green
Wood pulp (mechanical) – red
Cotton (normal) – strong blue to blue-gray
Cotton (mercerized) – green
Glass – doesn’t stain
Silk – dark purple
Color Reactions
S/B latex – red
Polystyrene acrylate – yellow-gold
Ethylene vinyl acetate (EVA) – pale yellow
Polyvinyl acetate (PVA) – red
Osmium Tetroxide Vapor Staining
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