Quote Originally Posted by pentaxuser View Post
Does the Darkroom Cookbook say what the chemical link is between thiocarbamide, complete bleaching, full sepia toning and the creation of a haze and why 3% acetic acid is the cure?

Thanks

pentaxuser
Since the haze is cleared by acetic acid I would say that it is caused by calcium carbonate being formed from hard water. The toner contains sodium carbonate in addition to thiocarbamide.