Other Open Access
A 3D printable and paper printable version of the Quark puzzle published by Eric Gettrust in "The Physics Teacher" in 2010, DOI: 10.1119/1.3393062
This is a resource that teachers can use to help students visualise the colour symmetries of quarks.
Note: stripes have been included to make the anti-particles more easily identifiable.
Eric Gettrust, "The Quark Puzzle: A Novel Approach to Visualising the Color Symmetries of Quarks," Phys. Teach. 48(5), 312-315 (2010).
Jeff Wiener, Sascha Schmeling and Martin Hopf, "An Alternative Proposal for the Graphical Representation of Anticolor Charge," The Physics Teacher 55(8), 472-474 (2017).