The process is called "tin-weighting". Tin, as everyone knows, is a metal comprised of lead and whatever other sh.t the alloyer had laying around the shop, usually zinc. The reason that this is done is because silk is sold by weight. The process Chuck describes of using heavier yarns is the honest, but much more expensive one. Tin-weighting provides the silk seller with higher income at lower cost. It also, should you decide to eat the tie as Chuck will be doing a demonstration of at A Collection of Sartorial Excellence, does give you a healthy dose of a well-documented carcinogen. It is in this manner that we shall be able to base our decision about the content of Carlo Franco ties on more than just his word.