Ive read at many sites that OTC blends are good for breaking in a new pipe. Prince Albert and Carter Hall seem to get mentioned most. Ive no problem with that because both of those are always on hand and PA is a regular smoke for me. I am just curious as to what properties make these tobaccos good for the break in. No ghosting is perhaps part of it but its my understanding they build a cake faster than some tobaccos. Just one of those questions that has to be answered