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The basics
Acid Brushes are available in two sizes: Medium: 5 3/4 " long x 3/8" diameter. Large: 5 3/4 " long x 1/2" diameter.
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The benefits
Acid brushes feature black horsehair bristles and strong metal ferrules.
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The uses
You can use an acid brush to apply glue, or other liquids and [certain] chemicals, and for quick small-area cleaning or wiping applications.