We have used chiral compounds with very high helical twisting power as components in induced-cholesteric mixtures in order to obtain new blue phase systems. In one of these mixtures anunusual large blue phase temperature rangeof more than 10 K was observed. The lattice constant of the BPI in this systemincreasesstrongly with increasing temperature, a behaviour observed for the first time. The threshold voltage for the field-induced BP/cholesteric phase transition in this mixturedecreaseswith increasing temperature. Thus thereentrantphase sequence cholesteric phase-blue phase-cholesteric phase-isotropic phase can be observed with increasing temperature if an electric field is applied to the sample.