Who discovered that silver nitrate has a recording function?

Henrich Schulz. In 1725, HeinrichSchulze1687-1744-1744), a medical professor at Adolf University in Nuremberg, Germany, discovered that silver nitrate solution would turn black under the action of light, and in 1727, he published a paper "The Effect of Silver Nitrate and Chalk Mixture on Light", which discussed the function of silver nitrate mixture to record patterns under the action of light, and Germans called it the ancestor of modern photography.