The Mike Ware quote is from his article on pt/pd printing, not Kallitypes. The normal clearing bath for Kallitypes is 3% citric acid.
I use Mike Ware's recommendation with pt/pd printing, and find it very effective.
A new book on Kallitypes by Dick Stevens? Couldn't find any description other than published this year and 400 pages which is double the earlier book. Very interesting, thanks for the info.