With the highly modified malts most of use use I thought the Iodine test went out years ago, but then again with express brewing it may have found another home...NTL,Hot Break, hot break, as pointed out above is not foam, but importantly..hot break (or the hot break) starts well before the boil, imagine, if you will, making stock, that crap that scums up before the boil is the cooking version, except in cooking you normally remove it, in brewing (well that another story).
On a related topic I tasted a Munich Helles this afternoon ,made with 30% Chit Malt...devine...
K