Rosin — also traded as colophony — and its chemically modified derivatives are essential tackifiers in adhesives, inks, rubber compounding, and paper sizing. The heading encompasses gum rosin (from living pine trees), wood rosin (from stumps), and tall oil rosin (a kraft pulp byproduct), along with their acids, esters, and hydrogenated or disproportionated derivatives. Derivative chemistry significantly affects melting point, color grade, and acid value, all of which are specification parameters that buyers and sellers negotiate in contracts. Rosin spirit and rosin oils, the distillation fractions, are also captured here and find use as solvents and varnish components.

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