During interphase, when the dna is in long thin strands and not yet visible, dna is what

chromatin material
Explanation:
During Interphase of cell cycle , the water content in the nucleus in high due to which the DNA appears as long strands called Chromatin fiber or simply chromatin material.
Later due to condensation ( Loss of water ) the chromatin material condenses to form thick structures called Chromosomes.

Answer evaporation and condensation;