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We investigate the two‐dimensional four‐color Ashkin‐Teller model by means of large‐scale Monte‐Carlo simulations. We demonstrate that the first‐order phase transition of the clean system is destroyed by random disorder introduced via site dilution. The critical behavior of the emerging continuous transition belongs to the clean two‐dimensional Ising universality class, apart from logarithmic corrections. These results confirm perturbative renormalization‐group predictions; they also agree with recent findings for the three‐color case, indicating that the critical behavior is universal.

Emerging critical behavior at a first‐order phase transition rounded by disorder