Inter-mixtures refer to the blending of different elements, often resulting in a heterogeneous mixture. As an antonym, the word isolation signifies the separation or segregation of elements, resulting in a homogeneous state. Isolation could be the act of separating out certain materials from a composite mixture, such as the separation of oil from water. Another antonym could be distinction, indicating the clear demarcation of different elements in the mixture, without any mixing. For example, a painting with distinct lines and colors would embody the concept of distinction. The word separation is another antonym that suggests keeping elements apart, with no blending or mixing. An example of this would be separating the various layers of sediment in a rock formation.