Sandy is currently working on an article about Kallitype and Vandyke. Everything I have been able to find regarding Kallitype indicates that, like Vandyke, in most cases additional sizing is not necessary. I recently purchased all the chemicals necessary to make ferric oxalate, so I will be experimenting with Kallitypes soon. Meanwhile, I've been trying various formulae for salted paper--I got excellent results with Namias' formula, which uses zinc chloride as the salt. I have various salt paper formulae at http://unblinkingeye.com/Articles/Salt/salt.html and some Vandyke and Kallitype formulae at http://unblinkingeye.com/Articles/Ferric/ferric.html.