Today we tried to make our first wet plate negative. Total failure however. The plate came milky white with some dark blotches out of the developer, with absolutely no trace of an image. Exposure was 15 minutes.
Any idea's what could have caused this ?
potassiumiodide+potassiunbromide used as halides,
9% silvernitrate solution
ferroussulphate as developer
sodiumthiosulphate as fixer