(Cambridge: Cambridge University Press, 1996). You can then back this up by actual experiments to confirm his observations. When you mention that generally when we refer to salt-prints we are referring to the latter, rather than the former. I thought calotypes were called calotypes and not salt prints. Perhaps what is in confusion here is that I am not referring to an alternative print making process, but recording the imagery as the image changes during chemical reaction. Perhaps this should be called Imageography?