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In the framework of Chiral Perturbation Theory including photons, we foundthat the contribution of the photon exchange between two intermediate chargedKaons to the slope parameter of the decay (\eta\rightarrow 3\pi^{0}) amounts to(-0.0221\pm 0.0034). When compared with the experimental value, (\alpha=-0.0317\pm 0.0016), on the one hand, and with the contribution of the up anddown quark mass difference, (+0.013\pm 0.032), on the other hand, our resultleads to the direct conclusion: \textit{The} (\eta\rightarrow 3\pi^{0})\textit{decay \uline{cannot} be used to determine} (m_{d}-m_{u}).

The Eta decay into three neutral pions is mainly electromagnetic