Red Ice

Red Ice is an enchanted ice that can only be melted by Blue Fire.

When Ganondorf took over Hyrule over the seven year passage that occured during Legend of Zelda: Ocarina of Time, one of the major things he did was freeze the Zora's Domain with a curse. In several places he created Red Ice, including encasing King Zora in it. Link managed to melt it and also to break the curse, though the cavern remains frozen.