Abstract: A non-corrosive photoresist composition containing:(a) 20-70% by weight of an organic polar solvent having a dipole moment of more than 3.5;(b) 70-20% by weight of selected amine compounds;(c) 0.1-10% by weight of (2-benzothiozolylthio)succinic acid.

Abstract: A Bi--Sr--Ca--Cu--O ceramic superconductor contains 0112 phases which are finely dispersed in a 2212-phase matrix with its c-axis oriented perpendicular to a growth direction.A method of preparing a Bi--Sr--Ca--Cu--O ceramic superconductor comprises the steps of growing crystals under conditions satisfying:G/R.gtoreq.1 and G.multidot.R.gtoreq.10000where G (K/cm) represents the temperature gradient at a solid-liquid interface and R (mm/h) represents the rate of crystal growth, and annealing the grown crystals in an atmosphere having oxygen partial pressure of at least 0.05 atm. within a temperature-range of 800.degree. to 860.degree. C. for at least 2 hours.