n Sample of rosin, or a mold of thermosetting plastic material, used as an unofficial standard in grading rosin. Such sample shall be so selected, sized and surface-finished that it will have the form of an approximate 7/8 in. cube with at least two opposite faces having smooth parallel surfaces and shall have a color when viewed through these faces which matches within rather narrow tolerances the color the corresponding official government standard made of glass.
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Gooch, J.W. (2011). Rosin Type (Sample). In: Gooch, J.W. (eds) Encyclopedic Dictionary of Polymers. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-6247-8_10142
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