Abstract: A preform for drawing superconductive wire is prepared by mixing fine particles of a superconducting material, containing barium, potassium, bismuth and oxygen, with a solvent, containing potassium hydroxide, in a tube. When the preform is heated and drawn, the superconductive material dissolves in the solvent. As the fiber cools, the superconducting material deposits from the solution as a solid network of crystals in contact with one another.