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By using the Coulomb gas technics we calculate the four-spin correlationfunction in the percolation $q\rightarrow 1$ limit of the Potts model.  It is known that the four-point functions define the actual fusion rules of aparticular model. In this respect, we find that fusion of two spins, ofdimension $\Delta_{\sigma}=\frac{5}{96}$, produce a new channel, in the 4-pointfunction, which is due to the operator with dimension $\Delta=5/8$.

Correlation function of four spins in the percolation model