I've just gone to rack & bottle a witbier that has been in primary for about 5 weeks and noticed this white gunk floating on top of the beer. It doesn't look too healthy, what is it? Is it safe? ...
Aside from the fact that they're two different types of grain, how do the two malted grains differ in terms of their effects in beer such as flavor, body, head, etc. when used as base malts?