Abstract
It is shown that integral eigenvalues of $\frac{Q}{e}$ can be achieved for Gell-Mann's quarks (particles belonging to representations of S${\mathrm{U}}_{3}$ with nonzero triality type) by the introduction of a new additive quantum number for strongly interacting particles and a corresponding alteration of the Gell-Mann-Nishijima formula. A possible framework wherein such ideas can be formulated is provided by an extension of S${\mathrm{U}}_{3}$ symmetry to S${\mathrm{U}}_{4}$ or perhaps a higher unitary symmetry.
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